Some friends tested this by swapping ported and non-ported factory barrels of identical length and weight on a Beretta 390. Using target loads we each fired 25 shots without knowing which barrel was on. Initially I could not tell the difference based on recoil or muzzle rise. Eventually I could tell the difference but only because the ported barrel was louder.
I've owned ported guns and for clay shooting I wouldn't not buy a gun because it was ported but currently none of mine are and I certainly would not spend money getting it added to a gun in the aftermarket.