Well, the short story is Intel performs better. Significantly better. It's not even up for debate anymore. Now if you bring price into the equation, an AMD processor will give you great short-term value (lower price now, but spend another $600 later when AMD CPUs can't handle games anymore).
The reality though is that, unless you are REALLY desperate to save $30 bucks from an i5 on say an FX 8350, which is AMDs top of the line CPU, the be my guest. I certainly regretted it, I wanted to purchase an i7 and a GTX 970, but I just had to get an FX 6300 that would bottleneck anything more than a 760.
I'm just being real with you here.