I did tons of sewing for twenty years, making gear bags and whatnot at work.
Unless you are planning on sewing multiple layers of very heavy materials, or are planning on sewing professionally, I would recommend buying a cheap, well reviewed modern machine. As a matter of fact that’s exactly what I did when I semi-retired and that machine has served me well. The reasons I bought an inexpensive machine:
I didn’t want someone else’s problem. I’ve sat down at many old sewing machines that had difficult to diagnose issues or broken parts.
It was an incredibly good value.
It has many more features than older machines. (Although most people will never use all the possible stitch functions.)
It’s just the machine, no table. When I’m done with my zipper replacement or tent repair I can tuck it under my desk where it’s out of the way and ready to go for next time.
Anytime that I can buy something that I need, does the job, is inexpensive and compact, it’s a good purchase.