You know, it's funny. If you had asked me a month ago I would've flat out said "No, all the countries are the same," but recently I have noticed subtle differences in countries. Now I don't know if it's just what individual sticks or squads have settled on each team, but I definitely notice that when fighting rooks, they routinely come in at 15k (not all of them, but a good number). I'm not saying every rook is a runner, but it seems that when you get some to blow their E, they tend to dive away. I like fighting the knights the best, they may not take bases but they sure do like to furball it seems, and I'm always all-for a good furball.
If you think about it, it would seem to make sense that each country would be slightly different. It's really hard to get away from the mob mentality (yes, even in a video game); when you see your friendlies doing it, you tend to want to do it as well. Plus, the new players will ask teammates for advice, so the team's flying style gets passed on more-or-less.
Being a bishop I tend to see a lot of missions (seems to be less being posted as of late, now that I think about it) and usually a pretty good furball going most of the time. I've also noticed we get vulture parties going on a pretty regular basis.