I prefer the bull bbl & adjustable sights, for accuracy reasons. For a trail gun the standard 4" tapered barrel with fixed sights has a huge following too. Of the 3 you listed, the 6" MKll HANDS DOWN. It would be an easy flip when you find a bull bbl with target sights. The big question is bbl length. I've gone back & forth at least 2-3 times. If I EVER get another Gov't, it aint going anywhere! OTOH the 4" target mdl is no slouch. You can't bump a mag release button that doesn't exist. LIGHTNING FAST MAG CHANGES, it's a 10 shot freakin target 22.