The main advantage I see to the .38Spl over the .44 is that it can be had in a smaller package. One doesn't see J-frame .44Spl because they simply wouldn't fit (no more than 3 or 4 rounds anyway). On the other hand, I don't usually favor anything smaller than a K-frame. Neither cartridge is exactly a death ray in the velocity department so I figure I may as well have a heavy bullet if I can't have a fast one anyway. One of the grandest carry guns I've ever seen was a 3" S&W model 629.