How to choose a college for Oxford?

I will apply to Oxford to study computer science and so far, based on looks and qualities to describe it; I have narrowed it down to 3.New, University, Oriel colleges.
I have visited Keble college but it didn't really feel right for me. I imagine many will suggest to visit them but it will be expensive and time consuming for me to travel there for 2 hours each way.
I am looking to take up sports at uni, would like a centrally located college and one with a fairly relaxed attitude to learning. I don't mind the size of the college too much but would prefer a close-knit community.
I would appreciate if anyone could give their experiences on how they chose their college and any extra relevant comments.

There is a good college suggester made by the student union.Here is the link. http://apply.oxfordsu.org/colleges/suggester/
Apart, from that you can look at what they offer eg: sports on their websites and on the student room there is pros and cons list of colleges for oxford.

Thank you so much, the link is very helpful!

There is a good college suggester made by the student union.Here is the link. http://apply.oxfordsu.org/colleges/suggester/
Apart, from that you can look at what they offer eg: sports on their websites and on the student room there is pros and cons list of colleges for oxford.