If you plan on eventually learning full ZBLL, then finish COLL. If you don't plan on ZBLL, then OCLL/PLL is just as fast (if not a bit faster) than COLL/EPLL.Should I continue to learn COLL? I average just under 10 seconds right now and I know about a quarter of COLL. Is COLL going to make my solves faster or would it be better to work on x crosses and lookahead instead?
Jayden McNeill once told me this: While COLL can make your PLL nicer, it doesn't really make it faster. If your EPLLs are significantly faster than your A-perms, then you really need to work on your A-perms. And the quickness of OCLL compared to COLL makes up for the occasional bad PLL.

