Sorry to be running late, as I have an account at both websites and posted over 2500 times at each, I am well qualified to comment. In this long post I tried to summarize the prominent social trends of both communities and evince the cultural values that underpin them.
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The following values are salient on the INTPc community.
-Appearing intelligent
-Promoting activities that establish some as more intelligent than others, for example the official IQ challenge and high IQ sub-forum. Mass of INTPness is another example, more subtle activities of this nature include threads in Academics and Careers or MBTI talk where people of one academic background are deemed superior to that of others. Similarly, people of one type (INTP of course) are superior to others, but in all cases, even if the intellectual superiority of INTPs isn't emphasized, one message has always been clear: Intuitives are superior to sensors and NTs are superior to NFs.
-Heated debating is encouraged. It accomplishes the aforementioned goal of making some appear superior to others by providing a competition which could rank some individuals as more intelligent or better than others. The informal nature of this kind of debating also contributes to the establishment of the pecking order I have just mentioned. The informality of the event easily allows for some to appear superior to others not by merit of exposition or reasoning, but by casuistry and appeals to the pre-established social order. For instance, when a person of a very high reputation clashes with a newcomer or one of a moderate to low reputation, the former will be thought to have said something more plausible or more important than the latter unless its altogether obvious that what the former said was meritless, which it rarely is.
What relevance does this have with respect to the main question? Most INTPs on INTPc uncritically conform to those values as the INTPs of this forum conform to the values of our community, hence, its important to know what the primary values of INTPc are. The values are as follows. 1. There must be a pecking order or a table of standings with respect to the worth of each member, usually the worth is taken to mean the same thing as intelligence. 2. Discussion of ideas is usually encouraged, however, not as an end in itself but as means to the end of promoting the first principle listed. 3. Maintaining the image of INTPs as superior to other types and most people both in the regard of intelligence and personal integrity. In summary, the majority of activity on INTPc is geared towards creating and maintaining the pecking order of intellectual worth, hence intellectual dishonesty, thoughtless conformity to the social regime are all acceptable only if they conduce to the maintenance of the order in question. However, when they do not, the most prominent posters will be eager to publicly rebuke anyone who engages in thoughtless conformity or intellectual dishonesty.
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Typologycentral.
-The creation of this forum was inspired by the 'great NF purge' championed by Hustler who embodies the core values of the community. He is a symbolic figure on INTPc who promotes the above mentioned values and the regime. A number of well known posters from INTPc were seeking to establish a scene of discourse where the pecking order is not nearly as distinct of a cultural value. Furthermore, it was also desired that NFs and non-INTP types have a forum where they would not be forced to conform to the rigid values of INTP-central or suffer from persecution.
Due to this fact, a firm cultural value was formed on this forum which to this day serves as the main distinguishing factor between the two communities: intolerance of the pecking order on INTPc. Consequently, the idea that a person's worth is to be appraised on the basis of his or her intelligence is either supressed or altogether excoriated. Furthermore, controversy and heated debating are mildly discouraged as they have been known to conceal the motives of maintaining the old social order of INTPc. The idea that some members are superior to others and therefore must be ridiculed or ostracized is deemed altogether unacceptable; it is combatted by the value of 'inclusivism' where all people are treated with some measure of respect to start with.
Certain INTPc scorn 'inclusivism' on the account that cultural values such as this one turned Typoc into the 'feel good shithole' or a community where any comment, regardless of its conceptual integrity can be deemed acceptable.
This may be true, a great deal of tolerance and forebearance is offered to the people of this forum who post substanceless remarks. By substanceless; I do not mean one-liners or notions that do not contribute to the community in any way, but notions destitute of intellectual merit. Notions of no scholarly interest or those that are fraught with factual inaccuracies as well as reasoning errors. One may say, posters who are devoid of serious ideas constitute a significant portion of the forum and that is a problem.
That is true, however, INTPc also suffers from the same defect as the majority of posters merely attempt to seem intelligent rather than pursue knowledge or sharpening their skills at the pursuit thereof. Is INTPc a place that is truly better suited for academic or intellectual discussions as Night has suggested? It does not seem so. Very few posters start intellectually stimulating threads and when they do, they are quickly derailed into subtle conflicts where people combat one another not for the sake of discussing ideas but for the sake of appearing intellectually superior to others. Quite frequently, shortly thereafter, thoughtless posters arrive and deluge the threads with subtle insults deriding the person of lower social status and rewarding the person of higher status. Either this scenario happens most of the time or the thread is simply ignored as most posters have no interest in discussing ideas of academic substance, at least not unless doing so offers them a chance to 'demonstrate their intellectual superiority over others'.
Altogether, there are very few intellectual discussions on INTPc, they are far more common here. For the very least, posters on this forum are not afraid to contribute to them and often do so, though often fail to propound substantial remarks. The main difference is that on this forum posters have greater liberty to explore ideas of their choice without worrying about incurring antagonistic sentiments.
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Summing it all up: the main values of this forum are centered around the principle of creating an environment where individuals of all types are free to discuss notions of their choice. The main values of the INTPc forum are centered around the idea of creating a pecking order appraising the worth of posters on the basis of their intelligence which has a certain in-built bias: the well established and highly reputed INTPs are to be deemed superior (more intelligent and therefore deserving more respect) than the newcomers or INTPs of lower reputation and more importantly, INTPs are superior to other types.
One may say that this forum accords to the 'NF values' as described by Keirsey and the other forum, as its most prominent posters would like to suggest, accords to the 'NT values'. I think that this statement is true, however, we ought not to make a mistake of equating 'NT values' with NT values as described by Keirsey. When I mention 'NF or NT', I am not referring to types or solidified unconscious dispositions but to mere, vague, if not arbitrary social constructs that descibe personalities belonging to some people of these types.
Communities endorsing values regarding the humble pursuit of truth, charitable and knowledge focused discourse are exquisitively rare today. In fact, such ideals hardly have a place in the contemporary academia. On INTPc and in most 'NT discussions', they have been usurped by values of shameless self-promotion and arbitrary denouncing of newcomers or poorly reputed group members for the primary purpose of maintaining the current regime.
Altogether, INTPs on this forum tend to conform to the cultural values of typologycentral by attempting to be at least somewhat tolerant and open-minded. The degree of hostility to others displayed by them on this board is also significantly lower than the degree they displayed on INTPc. When ideas are discussed they are not nearly as focused on attempting to prove their intellectual superiority to others. Instead of doing that, they take some measures to establish a constructive conversation, though in most cases of a personally relationally rather than of the intellectual nature.