I see much talk about the associations of these functions, but everything seems to be a regurgitative caricature of the same descriptions. By drawing these comparisons, I hope to help obtain insight into the interactions of these function groupings. Critique is welcomed, and if you enjoy at the very least reading, let me know - I have thoughts on other function groupings and how they interact when preferred in the user.
First, let's look at the two preferences of information intake, Se and Ne:
Se - A preference for accepting concrete, factual information in a manner objective to previous experience - a camera
Ne - A preference for accepting conjured, imaginative information in a manner subjective to previous experience - a kaleidoscope
Now, the two preferences for recalling information, Si and Ni:
Si - A preference for objectively viewing stored information relative to current experience - a monorail system
Ni - A preference for subjectively viewing stored information relative to current experience - a spider web
With Se/Ni users, you get a mind that objectively perceives reality with a preference for internally metabolizing information once stored. Situations are handled on a case by case basis and presumptions are likely not preferred to be made. The Ni user is potentially pleased when quick associations can be drawn (leading to fabled INTJ/INFJ smugness) since they are often meticulous about the parallels they draw through existences. This would explain also why Ni users are stereotyped as being assumptive in knowing where they can and cannot help you - if the line has not been drawn yet, it is obvious to the Ni user that the information is not applicable to the situation. I believe this can lead to self-doubt, and likely why Ni-dominants have auxiliary judging functions - the constant battle for 'drawing lines' yields an unquenchable desire to establish objective criteria.
With Ne/Si users, you get a mind that subjectively perceives reality with a preference for externally metabolizing information relative to past experience. To parallel the above summarization, situations are handled contextually, relying on the funnel of information to the various Si nodes of the mind to perceive assorted happenings. The Ne user, because of this preference, is mentally limber in the presumptions made about external stimuli (leading to infamous ENTP/ENFP quips). This is likely the reason Ne users are confident in their ability to aid in a situation - they rely on the mental interconnection their mind is apt at displaying to guide them through fresh experiences. I believe this can lead to over-confidence of abilities and likely why Ne-dominants have auxiliary perceiving functions - when information arises their mind is not capable of sensing, they will intuit an answer.
Let's look at some more dualities, in the form of popular MBTI type titles:
INTJ - The Scientist - Objective discoverer of physical phenomena
ENTP - The Visionary - Subjective interpreter of future events
INFJ - The Counselor - Objective discoverer of others
ENFP - The Champion - Subjective conqueror of others
ISTP - The Crafter - Objective manipulator of reality
INTP - The Architect - Subjective designer of reality
ISFP - The Artist - Objective illustrator of reality
INFP - The Idealist - Subjective conjurer of reality
Now one last set of dualities, focusing on type weaknesses (according to personality page):
ISFP - The ISFP is likely to not give themself enough credit for the things which they do extremely well. Their strong value systems can lead them to be intensely perfectionist, and cause them to judge themselves with unneccesary harshness.
INFP - INFPs have very high standards and are perfectionists. Consequently, they are usually hard on themselves, and don't give themselves enough credit. INFPs may have problems working on a project in a group, because their standards are likely to be higher than other members' of the group. In group situations, they may have a "control" problem. Under stress, it's not uncommon for INFPs to mis-use hard logic in the heat of anger, throwing out fact after (often inaccurate) fact in an emotional outburst.
INTJ - When under a great deal of stress, the INTJ may become obsessed with mindless repetitive, sensate activities, such as over-drinking.
ENTP - Under stress, the ENTP may lose their ability to generate possibilities, and become obsessed with minor details. These details may seem to be extremely important to the ENTP, but in reality are usually not important to the big picture.
In conclusion - and this will likely be a recurring theme I wish to accentuate during my tenor on the site - Se/Si are desirable traits to have high in your function stacking, and also likely why it is preferred at a ratio of three to one over the alternative. I presume many of you (as well as the famous) are mistyped, and I will be conducting trials over the coming period of time challenging willing participants. Sorry for the tl;dr, but thank you for those who did - I look forward to your responses.