There is no measurable difference between them, and the Tompkins table gets heavily skewed by specific course sizes at different colleges as noted above.
The only difference your college makes is: where you live, how expensive it is to live there, what it looks like, how many people are on your course. Supervisions are arranged BY your college but not necessarily WITHIN your college and it's entirely possible if you went to Girton (because you love cycling or something, idk) you would end up with several supervisions at Downing. Thus, trying to pick a college based on some notion of academic ranking is pointless.
You should look at the map of Cambridge with the campuses and colleges highlighted (there are several versions available on the Cambridge wbesite in various places) to get an idea where they are, and visit them to see which you like best. For reference, the main Law Faculty is located on the Sidgwick Site, which is in the middle of the campus areas broadly (slightly west of the town centre). Most of the law lectures seem to be based on the Sidgwick site as well, so any of the Sidgwick cluster colleges would naturally be convenient for gettint to lectures. Additionally, these are near the main university library which is above the Sidgwick site.
The central colleges are also quite close however, with Jesus being the furthest out, and Churchill and Fitzwilliam are only slightly further. Homerton is quite a ways out, as it's in town but sort of on the wrong side, although there are plenty of bus routes and cycling is fairly common/easy in Cambridge (although get a good bike lock because as the apparent cycling capital of the UK it's also the cycle theft capital...). Similarly Girton is farther north Huntingdon way, but people who go there don't seem to have any issues cycling/bussing around.
Basically, just find one you like the "feel" of and pick that one