The class rules for revolver in IDPA suck, they created a niche for 6-round .38 cals with 2" bbls, and that's IT. USPSA is better, but revolver is still a niche and very competitive. The GP100 dominates with moon clips and .40S&W or 10mm major, but the S&W 9mm 8-shot revolver is the one to beat in minor, which is eclipsing major in the nats and worlds lately. I never got a match rig for revolver set up because it was too specialized.
Revolvers are safer, simpler, and more reliable than pistols. They have the "look" they need for defense, no doubt. I am plenty fine with only 6 rounds, unlike most folks I know. I seem to be one of the only people to heed Boston T. Party's line, "A rifle is what you bring to a gunfight. A pistol is what you use if you're caught in one while you're getting to your rifle."
In other words, I'm not planning to stay in a gunfight long enough to need two 19-round mags!