I've tried stuffing with several small grinders, even my #22 1hp. Cabela's grinder, and they are too slow to do a good job. Now, a floor-standing full sized Hobart grinder will spit sausage out faster than you can get a lug under it to catch it. But, it's made for high speed use. The stuffer is the ticket. I've been in some meat shops that had stuffers (motorized, not hand crank) and they did excellent. But, then, I've been in others where we used the Hobart and it was just as good. You had a throat about 4 1/2" wide and an auger that pushed it so fast I'd busted more than one aluminum stuffing horn just from the pressure!
But, for home use, you can't beat a handcrank stuffer. I just stuffed 10lbs. of summer sausage into a hank of 32mm hog casing with my 15lb. stuffer and it did a great job and looked excellent too (as much as summer sausage can, not much separation or variety - just ground chuck and grey from the cure). Took longer to clean it up than it did to stuff it! But, it was nice being able to just load it once instead of 2 or 3 times with a 5 lb. stuffer (I used to use a 5lb. one in a real small meat counter I worked for a year or so in a small corner grocery back in the late 60's (69-70).