I was having the same dilemma, but my unconditional is unconditional even if I put it as my insurance (although I had to email them - Bournemouth - to find this out). It took a while for Bournemouth to get back to me, so I was pretty torn as to what to do because I got a conditional from where I really, really want to go (LJMU. To study forensics, btw).
My advice would be to ask current students of both universities what the university/city is like in general, and maybe even try and find students from each who study your course. You could post in the individual uni TSR forums to do this. Also, go through the course content and general course information (usually found on the universities website) to see which course you would prefer to study/which modules you would be most interested in.
Of course, it depends what the your grades and the entry grades are, but this is what I would (and did) do.:3