2 votes for heavier cues...
Here's a little background for you on why I decided to post this question. It came as a result of some advice I had heard from one cuemaker, that was confirmed by another, fairly highly respected cuemaker named Dennis Searing. Here's what Dennis said:
"Your friend is right. A cue that is too light will not get through the cue ball as well, plus you get what I call the "bouncing off affect", where it almost needs to be pushed through the ball by the player. It will also force the player to grip the cue a little firmer, which can kill liveliness the cue may be capable of delivering to the cue ball on it's own. Of course how heavy a cue you can play with, and for how long is going to be different from player to player, but a heavy cue is much better.
This is one of the things I learned from Mizerak years ago. I think you already know I built most of His equipment for the last ten years of His career, as well as played in many of the same events against Him. I asked Him how come He liked his cues so heavy (21.2 oz)? The first answer He gave me was that with a heavy cue, you have a much greater sense of touch and feel in a shot. Then He pulled me aside, and proceeded to make me shoot some shots, and proved it to me.
If I was asked what I thought was the perfect weight cue for most pool games, my answer would be from 19.5 - 20.0 oz. With my size over 20.0 oz would get to be too heavy after a few hours of play, and lighter than 19.5 won't get through the ball as easy with as little effort. Of course this is just my opinion, but I believe not many would argue if they play. Plus, with a heavy cue, you're able to hold the cue loose, and let the cue do the work. Look at Efren Reyes and how loose He is, and He plays with a very heavy cue."
The other vote was from a legendary player's perspective. The fact that Mike Sigel played with a heavier (20 oz.) cue for *possibly* his entire career, and he didn't seem to have too shabby a stroke, either!