I'm looking for a new pc but theres so many mixed reviews on what to go for I just can't decide

I was all set on a dell pc but then people started telling me that the Intels aren't as good as AMD's with games and the speed of them so now i've been looking at these and people tell me the AMD's aren't as reliable as the Intels
I've not go loads to spend with a max of £600 so I no I wont get a top spec but I'd like something that will last a few years with the possibility of upgrading later instead of replacing.
So does anyone have any recommendations? Or information on whats best and what to look for?
Thanks in advance,
Chris