Your text says "scope or red dot" but your title says "red dot". Sounds like you have decided on a red dot. If so, my post will not be useful to you. But FWIW I chose Leupold 2X EER scopes for my two S&W 629's (.44 Mags) and S&W M41 (.22 LR short barreled squirrel gun/target pistol deluxe). Have used them for 10 years with good success and no problems. Good luck with your choice.
Good shooting and be safe.
LB
ps: Scopes of more than 2X have limited fields of view, magnify the wobble more, and are harder to see thru (esp in the field) due to smaller exit pupil diameter. Real benefit of a scope is putting the target and crosshairs in the same focal plane so you can see both sharply at the same time.