... it's more stable, that doesn't necessarily make it stable ... Seasonal variations, plus major appliances in the home kicking on and off still make it more variable than using a voltage regulator.
As with many audiophiles, I take a "source first" approach. Using a proper dedicated line can essentially eliminate the voltage drop typical of a daisy-changed convenience outlet. Power conditioning, including voltage regulation, can then further improve the AC. It's not an either/or choice.