Hi
If you have offers from all of these universities! Congratulations!
They are all quality universities and you are definitely not starved for choices!
I think in terms of which university you "should" firm, only you can be the judge of that. This is definitely about personal preference. Each university offers a different experience. (If I were in your position I would pick UCL but that is just because I applied there and I do not particularly like the other two universities as a matter of personal preference
)
I mean the first thing that I think you should consider is definitely the course above all else. What modules can you take in each university? And because the course in Durham is different from the other two, do you want to do PPE or Politics and Economics? Choose the university which has the course that you like the most and are most comfortable with. After all, you are in university to get an education first and foremost
You have to enjoy what you are studying because you are going to study this course for 3 or more years!
Then the next thing that is the most important is to look at opportunities each university has to offer, where you can go on study abroad programmes, student societies, career centres etc... These are an important part of the university experience and you have to make sure that you are satisfied with the opportunities that you have in each university.
Then you also have to consider is location and accommodation. Being in a big and cosmopolitan city like London is very different to being in Coventry or Durham. The residential college experience in Durham will also be really different from the student experience in UCL and Warwick so that is something to consider as well. The question you have to ask repeatedly is, what do I want from my university experience?
You can use this website (
http://unistats.com/) as a helpful point of comparison between all of the universities. Remember that you don't have to choose your firm and insurance options until a few months later, so you don't have to be so eager to choose now. After all, it is better to think about it and make an informed decision because after all you will be spending the next 3 years of your life maybe more studying in this institution.
I hope this helps and good luck