NGG in my opinion is the best of that bunch.
Good shot variety, great mechanics, humor, flow, and the hole in one shot is pretty damned cool.
Never would have bought one on purpose, but I accidental fell into one, and I'm quite glad I did.
Fishtales has always been a meh for me. Cool ball lock mech. but the symmetrical ramps clog up too much of the playfield.
I owned a WCS for a while and it never really grabbed me. Good game, and that's it.
I haven't had much time of Flintstones. I think I like it the little I've played it.