Really depends on what you are doing. A few rounds of precision rifle for BR comps, the forster is the standard, I think(It is slow and clunky, but that isn't an issue for that purpose).
Just want trim up 50 or 100 cases of 30-30 or whatever that will last you multiple seasons of hunting, can't beat the Lee basic length trimmer gauge thing.
If you have money to burn and want to impress the internet there are several options of power tool ran specific caliber trimmers and a couple ridiculously pricey stand alone machines. .
If you want to trim the occasional ice cream bucket of .223 or .308 range ammo a good fast lathe trimmer like the Lyman universal is hard to beat. The universal collet/chuck is very quick, even hand cranked it is just a tick off the power options, any of them.
First world problems, we have a boatload of options.