The 4" will be unpleasant with full-house factory loads, the 3" miserable. If you load your own then either is OK. Otherwise shoot Specials, which is also OK. Ported guns aren't for everybody. Some like them, some don't. I've only owned one, a 3" 657, and I wasn't thrilled. Blast is increased, and 20-30 rounds was enough to make the front sight invisible due to fouling (lead bullet loads). Recoil isn't so much reduced as redirected back toward you, but muzzle lift is reduced dramatically. In low light the blast from the ports was pretty impressive. I won't buy another ported gun.