I can turn out a BUNCH of ammo pretty quickly on my 650, especially since I added Mr. Bulletfeeder It is simply amazing frankly.
No, I've never loaded on a 1050 or an 1100. I'm not sure either one would turn out better ammo or do it faster than my 650. But since I've never loaded ammo on either, I can't say that with certainty. There's a reason Dillon makes them and they sell them.
If I had unlimited funds (and shot a LOT more than I do), I'd get an 1100 for the swaging/primer seating adjustment (and automate it) but I'm getting along fine with the 650 as is. (I do have a Dillon Super Swager bolted to the bench alongside the 650 to swage the occasional crimped brass.)
Bottom line, for me, it comes down to $$$$.