I use Shin Gos and Red Rippers. I like the Shin Gos because I can replace the teeth part and the angled part that is rubbing across the roof. I've had them in metal, wood, and fiberglass and they last from longest to shortest in that order. The metal are a little heavy and the wood ones are perfect.
Most of my guys seem to like the Red Ripper. They're great when they're new and nice and light. My one complaint is when you wear them out, I either have to grind new teeth out or just buy a new one. I guess most are like that if you can't replace the teeth portion of it.