The one closest to the management school so Pendle or Grizedale are good choices. All colleges are the same apart from that some people are trekking 15 minutes to their 9am lecture and others are rolling out of bed into the lecture hall.
European Languages is based in Bowland North and have seminars as far away as County however, so you might have to do a little trekking wherever you live.
Everybody goes to everybody else's college bars depending on what's on, it's not like you're only allowed in your own bar. But you are only allowed accommodation in your own college so think carefully about where you might want to be stuck living for at least one and potentially 2 years!