There's a gap between Warwick and Exeter even for law. If you can't accept this, it's all up to you and I won't argue with you any further. But there is, whether you agree with me or not, or you like it or not.
As to which campus is nicer, I think that's all subjective.
10 years ago, i would have chosen Exeter easily. But as I see a lot of developments happening at Warwick now, i couldn't say for sure if Exeter looks better than Warwick now and in the future. There's a massive construction development on campus and hundreds of millions of pounds were put in.
Then, of course, if you prefer Exeter, by all means, go for it. But do not say Exeter law is as brilliant as Warwick Law just because you personally prefer it to Warwick law.