I prefer the tapered barrels because I've found that they work better for me in rapid fire DA shooting. When I am in practice, I can group my tapered barrel model 67 at 3 inches at 40 feet with a 1/2 second split time. With my model 620 using the same ammo I'll get a 4 inch group. That difference isn't due to poor accuracy from the 620, I've shot the 620 from a sandbag rest at 35 yards and it's a freaking rifle. The difference is due to the inertia of the heavier barrel impeding returning the gun to point of aim. Heavier barrels require more effort to get moving and more effort to stop once they are moving, as a result even though there is less muzzle flip with the heavier barrel my groups will generally get larger when shooting rapidly.
PS, yeah a 1/2 second split isn't that fast. I've seen Jerry's record speed shooting and frankly I just can't believe that any Human can actually pull a trigger that fast. Frankly, I'm starting to wonder if he's a robot from the future or from another planet. Eight rounds ON target in just one second with a DA trigger, that is simply stunning.