I use an eggbutt snaffle with a lozenge. Monty loves it. I have tried soooo many bits with him. Kimblewick (because I felt like I needed more control), single jointed sweet iron snaffle, thick loose ring snaffle with a lozenge, rubber loose ring snaffle... there are more but I can't think of them off the top of my head.
Sometimes I do feel like I need more control so I briefly considered trying a pelham with double reins & riding on the snaffle rein 99% of the time, using the curb rein only when Monty wouldn't listen. Only trouble with that is that the pelham is not dressage legal and so I would have to go back to the snaffle for that phase of eventing... and dressage/flatwork is when he's the hottest. Or I'm at my most nervous, or whatever it is.