I like both unis but for completely different reasons.
I like Imperial because I've lived in London my whole life and it would feel wierd to move away and it would be cheaper if I live out one year and then travel for the rest) and I also think (me being british asian) I would probably fit in at imperial better as there are quite a lot more british asians there than warwick (not being racist I love hanging out with other culture but I just don't like being the odd one out). But some of the things that I have heard about the imperial maths course are putting me off (don't get much help but are thrown into the deep end). Warwick is amazing. I absolutely loved it when I went there and for people saying that there isn't much to do there is plenty and it is a lot more sociable than you think because it is a campus uni.
I guess I would probably pick warwick over imperial but that's my choice. You should try visiting them and see if you can see yourself there