It’s a shame @albertporter doesn’t post much here anymore--he had a wealth of good tables, including the Walker in its heyday. Albert told me he got into a Lenco with the various mods and liked it, but that eventually led him to SP-10 mk ii and iii. I know he did a lot of work on the plinth, a support for the bearing and other details that escape me. If it were me, and I wanted a top tier table without issues, I’d probably just buy whatever that top Technics is, have a plinth that can accommodate a couple arms and call it a day. FWIW, my main table is the Kuzma XL with Airline, so I’m not trying to sell you on what I own.
I will say that I bought the very first series SP-10 in 1973, brand new, and with a go over by the late Bill Thalmann, including the Krebs mod, a plinth that accommodates multiple arms, this table has been in and out of service (it always worked but the on/off switch got funked up at some point and Thalmann took care of it)- figure I’ve owned and enjoyed that table for more than 50 years.
I think it is very hard to compare turntables, almost impossible, in today’s retail environment with the necessary controls over variables. I suspect a lot is based on ergonomics and appearance. Before I bought the XL, I did have the Kuzma Reference with a Triplanar, and using the same cartridge, switched over to the XL/Airline set up. Big difference. But I had the components in my home, in my system to hear them.
Not sure what your budget is, but I’m a little wary of used electro- mechanical devices. And set up is key- huge differences between ok and "nailed it." I used Mike Trei when I lived in NY. He made it look easy.