I guess I ride one-handed with the more experienced horses or the horses that work best that way, and ride two-handed with the greener horses and the horses that work best that way. It depends on the horse, really -- my mare has trouble with bits, so I actually one-hand it in a sidepull, so I have the option to direct rein or neck rein. She responds amazingly. My gelding responds best to two-handed direct reining, so that's how I ride him.
Candy | 14.3hh sorrel AQHA mare
Diesel |15hh bay grade gaited gelding