Craig Bellamy actually hasn't won anything with Cameron Smith. He is a superb coach, but a fair way behind Bennett imo.
Presume you mean without, no one's won anything in that time apart from Penrith.
Wayne Bennett's last premiership was in 2010, was it not?
We play the comparison game and it's fun to play, but you're never comparing apples with apples. It's not like comparing two golfers who play on exactly the same course at the same time. People could mount arguments for either.
The consistency of Bellamy sides is unrivalled, almost through history unless you look at the 11-straight Dragons.
Bennett has won more, at Origin, Test and NRL level.
Bennett has never been in charge of a team that was stripped of premierships for cheating, with the knowledge that the coach has their fingerprints over everything that happens at that club (as with Bellamy)
You say Bellamy never won anything without Cam Smith, but Bellamy developed him. Wasn't Smith a 7 coming through (he debuted there) and teams overlooked him on size?
So yeah, it's really hard to judge. I wouldn't even try. Both are outstanding