The "best" ammo is what shoots best in your particular pistol. After it is broken in, try a number of dfferent kinds of ammo and see if any of them shoot perticularly well.
With guns in general, and especially 22s, a gun will be terrible with some kinds of ammo and much better with others. Once you know the severl kinds it shoots well with, then you can consider cost and cleanliness.
My Ruger 22 pistol does best with Winchester T22.