The Student Room Group
Best to go somewhere that suits your politics and identity. If you are particularly left-wing, you probably want to go to Balliol, if you're particularly x, you probably go to one with a reputation for x.

Alternatively, you may want to pick a college based on a reputation for a subject, in order to access their tutors that are particulalry good in that subject.

Or you could choose one based on likelihood of getting in, financial assistane availalable, location or even atmosphere.

Best thing would be to find one that synthesised all these things. Hard tho', and usually fraught with trade-offs.
Reply 2
My second question, are their any german speaking students (German,Austrian,Swiss)?? I wanna know if somebody study in the UK and what is his/her opinion!