Cyp and Enan are pretty much the same. I think it's their half-lives that makes them differ, but not to a significant extent as if we were talking about the differences in, say, cyp and prop etc. Sometimes, the other difference is that you get more mg/ml in enan than with cyp (but that can vary from brand to brand).
Also, I've heard (only from a few guys from my gym) that they got a bit twitchier or more aggressive with cyp as opposed to enan. I know some prefer either one or the other due to the ease at which they can get it too. Over here in the UK, Cyp anf enan are pretty easy to get hold of, but, apparently, Cyp's a bit trickier to get hold of in the states.
I'd go with the best quality you can get for a decent price, as its potato potato for me, concerning these two tests.
You ay want to consider throwing something else for the PCT, as well as the Nolva - HCG might be an idea.
Good Luck.