I don't know anything about those machines. Just wanted to say that the 191 sure has a nice throat space.
I have an 1932 Singer that is a workhorse, as well. But, like the 191 only does straight stitches. If you make any kind of heavy tote bags, that machine will do it. I use my old singer for tote bags and it will sew through the thick fabric like a hot knife through butter.