Interesting divergence of opinions here - --
Some like porting, some don't.
I agree that I'd far prefer to buy a revolver WITHOUT porting, even to the point of offering more for a non-ported version than one with ports.
I believe that porting has a much more noticible effect in long barrels than short ones. I believe this has something to do with the length of the lever arm. The muzzle of a 6", 7-1/2", or 8-3/8" barrel is a LOT farther from the wrist joint of the shooter than with a two-to-four inch barrel.
Granted, I'm going mostly by subjective impressions and intuition. I do not have the hardware, nor formal training in physics, to set up any scientific measurements BUT - - I've shot a number of ported revolvers, and a few ported autos, and this has been my observation. The effect of porting has, for me, been most noticible in the Ruger Super Blackhawk 7-1/2", shooting full-house Winchester 240 gr. .44 mag loads. A side-by-side comparison of two of these, identical except for the porting, indicates the ported revolver has a very reduced muzzle flip.
On the other hand, I can't tell any difference between a ported 3" M13 and an unported 2-1/2" M19, using the same ammo. Years back, a friend got an older M13 and we shot it quite a bit with various ammo with the original four-inch barrel. He later had the barrel cut to about 3" and Magna-Ported. He also had the butt rounded and put on custom stocks. While it seemed no more difficult to shoot than it had in four-inch trim, neither did it seem to have any LESS muzzle jump.
I will observe that the many shooters consider that magnum loads, fired from a short barrel, SEEM to "kick" worse than in a longer barrel gun. I believe this is a function of the increased muzzle blast, and not a function of free recoil.
One old shooter's opinion - - -
Best,
Johnny