Repeat after me: None. No difference in effect, in half-life, in efficacy, or in time it lasts in the body. There is no functional difference between enanthate and cyp. None.
Except, perhaps . . . I've noticed that after a good hit of enanthate, I get a zit. After a good hit of cyp, I get two zits.
But that's anecdotal. As is everything you read about the differences between enanthate and cyp.
Except, at least here in the States, that cyp is half the price of enanthate.
Past that point, there is only one different link on the chemical chain between the two, and no functional difference at all.
Well, except that I prefer enanthate to cyp because, in terms of pharmaceutically-produced test for humans made here in the States, I like the name Delatestryl (enanthate, from BTG/Bristol Myers Squibb) more than I like the name Depo-Testosterone (cyp, from Pharmacia/Upjohn).
Get the picture? It's totally a matter of perception. Totally.
So repeat after me: There is no functional difference between enanthate and cyp. Zippo.