On my Buck Mark, I'm running a Vortex Venom. Mount is only available for the Doctor / Noblex pattern, so that limited my selection.
On my Trailside, I'm running a Vortex Razor. Was able to get a 3/8" dovetail mount direct from Vortex, so it clamped onto the barrel dovetail nicely for a clean, no-drill install.
EDIT: Not sure what is "Best". That is a bit of a user-by-user case and how deep your wallet is. Some may recommend an Aimpoint, but some would consider that a bit over-kill for a 22lr plinker.
I've shot the Razor / Trailside combo, very nice set-up. Haven't taken out the Buck Mark / Venom yet. Just finished that build for the Mrs.