I sometimes prefer to RP with one person, or with two or three people. Everything's going nice and fast, while in some wolf packs, especially if they're big and many members are active, RP-ing might become a mess of words if people don't pay attention to the order of the posts. Also, there may occur many types of roleplaying and literacies in a big group and not everyone is satisfied with that. Some people type abnormally large posts, long more than two pharagraphs, which personally to me is a bit annoying (I'm not trying to offend someone, I'm just stating my own opinion and you don't have to agree with it) because the player can describe just one action at a time so the roleplay goes faster. I would accept two-or-more-pharagraph-long posts only when I'm roleplaying with a single person.
I, as a foreign player (not english), also don't really approve wolfspeak. Those twisted words and really long sentences often confuse me or make me give up roleplaying. I prefer clear, understandable english so
everyone could understand. I also don't really like groups that are too literate, 'strictly literate', I feel like I just HAVE TO use more uncommon, creative words, which might be a bit hard for a person whose native language is not english, like myself. Of course, this is only my own opinion and I'm not saying people shouldn't RP like that. Everyone is supposed to RP however they want and I'm just stating my opinion.
I usually struggle finding a person to RP with, because most players are looking for groups with maps, plots, rules, websites and etc. These groups to me are a bit too obliging. Yes, I would join a group like that if I have a character that is meant to be in a group, but what if I have a loner character and still want to develop them after all? I want to develop my loner characters quickly, so I tend to look for RP buddies when I feel like RP-ing.
So, summing up, I prefer roleplaying with a single person than joining a group, because the RP goes faster and is not as obliging as a group RP, although it depends and if the group is really good and tempting I'm joining without hesitation. I prefer the group I'm joining to be rather small and simple (although I might sometimes feel like joining an extra-realistic group which is very detailed in everything). I strive to avoid wolfspeakers and want to roleplay with people who use understandable english.