I tried pooly too since it has that awesome pool extension so you can make different pools for level 1, level 2 and so on so you can break down the loading time. Unfortunately, whenever i contacted the dude that made it for something it took him ages to answer and even longer to do something about it.
I am using coregamekit (with pool boss) currently, and unfortunately, it does not have an option of multiple pools which can be manipulated on runtime, which sucks, so i'll be probably changing it. But the cool thing is neat UI which lets you drag and drop prefabs in bulk for pooling.
But i have the same problem as you, i don't know what to use.
PoolManager
http://poolmanager.path-o-logical.com/ looks good and there's PM actions for it, but they suck, there's no spawn action.
Also, Djaydino made actions for LeanPool, but i don't know how robust it is and if there's a possibility of having multiple pools.
Pooler actions for PM are to simply to be usable, you need to put every prefab into pool via separate action which is blah, same as LeanPool.
There should be internal pooling system in playmaker, i guess they'll probably leave it for 2.0.