Little crow gunworks world’s finest trimmer. I just have a cheap ryobi cordless drill with one chucked up 100% of the time. Stupid fast, stupid consistent, stupid easy to use. Can’t recommend it enough.
Everyone will say Giraud, $500. I haven't used it, but good reviews. If you're looking for just a basic one. The Wilson case trimmer is not bad. Bought a Lyman my first time, big mistake. But, everyone has there preference, or opinion. I say just find one that fits you, and go with it