I prefer Typologycentral. This site allows me to call sensors "gristle" without receiving an infraction. Just kidding.
On the other site I received an infraction for publicly posting my password in one of the forums (how did that break any rules?) and another poor soul received an infraction when he used my password to leave a lovely picture and a nice message for me. Completely unfair. I would like to think the TypoC mods are more mature about such matters.
On the plus side for PerC however is that whenever they catch me using one of my sockpuppet accounts they ban the account but leave my main account alone? Last time I tried it then unretired my main account and I received no hassle, warnings or infractions? This was despite me making probably more than ten sockpuppet accounts and publicly confessing my crimes (and promising to make some more.) I guess they can be lenient.
Otherwise I would say the community is more memorable, the forum is not excessively large, there probably aren't that many mistypes here and the topics are (in my opinion) more engaging/mature.