I've got a Powermatic 65 (predecessor to the 66) and love it. If you happen across one, it may be worth a look. That said, there are some other choices if you want a serious saw with a small footprint. Atlas, older Craftsman, Walker Turner, Duro, and i believe Davis Wells all made cabinet saws with the motor under the table (not hanging out the back). There was also a DeWalt badged version of one of the Atlas models. Great saws. The "Junior Unisaw" is also a great machine, albeit with an 8" blade. We found one for my Dad, and after using it, he kicked his 10" Delta out the door. He doesn't rip 4" material on his table saw, and the Uni Jr. handled 3" thick stock a lot better than his newer 10" saw. I'm not recommending any of these options over the two you listed, but i wouldn't exclude them if you came across one in decent condition.
They all cut wood, and well when tuned up. I have my preferences, but shy away from the "Ford vs. Chevy" debates. They all have their strengths and weaknesses. A lot may just depend on what you find. Expanding to include other good options might help.
Good luck with the hunt.