I had a 642-1 since 2009. Went with it for a few reasons... mainly the weight, and also, I was never a fan of .357 Magnum. Love .44 Magnum, but don't feel .357 gives the performance that the negatives (noise, recoil, etc) warrant. I'm sure that will piss some people off, but I don't own a .357 Magnum. Was considering a TRR8, but more because it is an eight shot revolver than being a .357.

Ballistically, I converted my 642-1 over to 9mm. If you chronograph velocities, a good standard pressure 147 grain 9mm (Hornady XTP) leaves the barrel roughly the same speed as a 110 grain .38 +P (Hornady CD). At the same speed, the heavier bullet is better. Recoil is on par.