The difference between an industrial sewing machine and a home use is about equal to the difference between a real oven and an ez-bake oven. That ez bake sure makes great cakes, small ones though.
For the cost of a new machine, used industrial will outshine pretty much always. If you're comparing an industrial machine like a consew 206 to a singer 99k and saying they're equal on a short use basis minus feed issues I say that's like comparing tow ratings of vehicles while pushing them downhill. One sure is cheaper and smaller, but for those times when you can't "roll downhill" that 3/4 HP clutch motor sure seems like a good choice.
If you are planning on sewing heavy items I'd suggest taking one small piece of advice. Sewing something your machine isn't meant to sew has a higher than acceptable chance of breaking it. If your machine made in the 1930's breaks and you need parts, you might be able to get them, but do you want to risk it?
--If a cow laughs hard, does milk come out its nose?