My go to and favorite handle is one made by Stuart Batty that was purchased at Woodworkers Emporium years ago. It's made out of some composite material (carbon fiber?) that is comfortable to hold in warm/cold weather and has ribs along the length to prevent it from rolling. Gouges are held in place with an ER collet. The gouges are easy to remove for sharpening. The only downside is sawdust prevents it from closing sometimes and has to be blown out with compressed air. Unfortunately these are no longer made. What's your favorite handle?