I have a Consew 255RB-3, a lot like the one you're looking at. This machine would be a lot newer than either of the other two. I would choose the Consew, but the Pfaff is a Cadillac. It would be the oldest of the three. The Pfaff also is very expensive to buy parts for, easily twice the cost of similar parts for the other two. All three machines will work well for you. The larger bobbin is great if you ever have to sew with large thread.
No one lives forever, the trick is creating something that will.