I'll fly the Christ Church flag
As a lawyer I would say we have excellent law tutors, our head law tutor in particular - John Cartwright - is brilliant. I've only been taught outside of college for two subjects: one was tort and the other was criminal law which was with a guy called Jonathan Herring. Any Oxford lawyer will rave about Herring and at Christ Church you're guaranteed to be taught by him in your first year. We also have a 24 hour law library which is a big plus considering the main library is only 9am-12am. Also, there's a nice, friendly atmosphere in the law library as it's a bit more relaxed and you get the chance to chat if you need to. Another plus is that Christ Church gives you a £240 book grant for over the course of your degree. This works out to around two law books a year out of the usual 5/6 you will buy.
Nearly all first-years are given en-suite rooms in which you have a fridge and are allowed a kettle. There are also tea points in every Blue Boar (main first-year accomm) staircase which have a microwave and toaster in them. Having said this, hall is incredibly cheap at around £2.20 each night for a three-course dinner. I think this is the cheapest food out of all the colleges and makes a big difference if you're concerned about budgeting. Accommodation is one flat-rate meaning you're not made to choose accommodation based on what you can afford which I think is nice
Also, if you qualify for the Oxford Opportunity Bursary (i.e. your household income is less than £50,000) then you receive a 10% discount on your accommodation. Because of this, mine worked out around £1000 a term this year.
Finally, Christ Church has an excellent reputation for sports (we have our own sports ground down on Iffley Road) as well as being renowned for rowing if that was something you wanted to try.
Everyone will be biased towards their own college but there are LOADS of reasons why law at Christ Church is awesome
Feel free to PM me if you want to ask any more questions.