I'd probably rate PoE and WL2 about the same. Both are solid, but also rather flawed games. I haven't actually finished either one yet though. WL2 because the DC introduced a bunch of new bugs, including a couple game-breakers, and they still haven't patched it yet. Patch is supposedly due next week finally, along with a follow up hotfix that should get rid of the memory leak in the version of Unity 5 they're using. Haven't finished PoE because I restarted the game like half a dozen times getting my party designed just right, and then they dropped a patch on me that made large, sweeping balance changes.
Basically, do you want a modern version of Wasteland/Fallout or do you want a modern version of Baldur's Gate?
PoE is 50% off on Steam right now if that makes the choice any easier.