Pfaff is a good, industrial name ... one of the real workhorses in a factory, if they have one.
If you want to do free motion quilting, though some don't do it, one of the most important things for me is to have feed dogs down feature ...
I want a machine to sew forward, sew backward, feed dogs down.
If you can move the needle left, middle, right ... that is a good bonus ...
not necessary for FMQ, but a good feature for piecing and the odd project you might decide to do.