If you don’t want a part of your body to get sore, then that part shouldn’t be pushing against something that doesn’t move along with it. That’s the thinking behind the vabsRider bicycle saddle, the two sides of which pivot in time with your pedaling.
I prefer uss, but it’s really a per-person preference thing.
I bought a used Infinity a few years back. Quite affordable, even with shipping. Sure it’s old and heavy and has nothing modern. But damn fun and very solid.