My BUG is a Sig; but I own and have carried the S&W 642 Airweight. The one real advantage of the revolver is that it can be fired from a coat pocket. Most days I choose capacity as the greater advantage.
Understand your choices and reasons. We'll list firing from a coat pocket #1 for advantages. Of course, this also means you can have your hand on your gun before the aggressor knows it.
1.) Able to shoot from coat pocket.
2.) Won't get pushed out of battery during contact shots
3.) No expensive magazines to purchase and maintain
4.) Just as reliable as a Glock
5.) .357 versions will shoot 2 different types of ammo (.357mag or .38spl)
6.) Conceal in pants pockets better than most semi-auto's except for the tiny .380's