I have a 70's Delta Unisaw. I have used a Sawstop frequently and cannot tell any difference in performance or accuracy between the two. Of course the Sawstop gets the nod due to safety. But lets add in another factor, a sliding table. The sliding table adds a whole new dimension to performance. I think it is also a safety feature. I added an after market sliding table to my Unisaw and love it. Sawstop also has one but I have not used it. If I were to upgrade it would be a saw with the sliding table. I like the old Oliver's, Hammers, or maybe a SCMI. I also have a small Hammond Glider Trim O Saw with a sliding table. Extremely accurate and just a joy to use, it cuts everything for my segmented turning.
For my bandsaw I have a old 20" Delta. I really like the large table and its probably good nuff for me.