RE: Any advantage either way for the Mosin M44 or 91/30?
The M44 wasn't built for accuracy, it was just a cheap, reliable, simple war machine.
I don't think there ever was a M44 sniper model, it was always a 91/30.
Just get what you like best, it doesn't have to be practical, if you just want a cool yet working rifle, and like the M44 in looks better than the 91/30, get the M44, whatever you decide, it's going to be your gun.