JP Korsteel lozenge eggbutt
I have one in every size, and every horse that comes to me for training starts in it, and very few wind up needing anything else.
It's interesting, I was watching an interview with William Fox-Pitt a year or so ago, and he mentioned that bit preference in his experience is all about the rider. He tends to lean towards full cheeks. I prefer eggbutts.
I would say a plain eggbutt, but I have run into several horses that just didn't like them.
So I do have one bridle, and pretty much ride everything in a D-ring (with the cheeks shaped, so it acts more like an eggbutt) double-jointed snaffle. It is made of sweet iron, which I find horses really like. The canons have inlaid copper, and have a curve to them. It is handmade in New Mexico by a fellow named Greg Dutton, and I haven't had a horse go poorly in it: http://www.smithbrothers.com/eggbutt...-010111/cn/35/
I think the only bit I have left on any of my bridles are various loose ring snaffles!
I have a fat eggbutt loose ring snaffle that I bought at State Line Tack for my first horse when I was kid. It was the cheapest bit in the store; I think I paid about $10 for it. I've used on probably every horse I've ever owned at some point!
Don't fall for a girl who fell for a horse just to be number two in her world... ~EFO