Any experience with these turntables?


Thinking about getting my feet wet again with turntables and analog audio. A new friend of mine in audio, who works on these audio kits has a variety of TT he wants to get rid of. Has anyone had any of these? Which vintage model might yield the best fidelity?
AR XB (needs mat and cartridge), Sansui SR-4050C (mint condition, but needs auto off switch fixed) Marantz 6100 (pretty clean) and lastly Garrard Zero (fair condition). All tables would need a new cartridge I would assume.
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Don’t  bother with the Garrard. It is a cheap plastic table with an even cheaper plastic arm.  I used to sell the Zero100C back in the 70’s. Brand new they were junk, the sliders on the arm jammed up constantly and we got at least half of them returned as defective.   We dumped the Garrard. line because of that.  I don’t usually agree with millercarbon but in this case, I do 100%. 
Again thanks guys. I look to the turntable experts here and have not been disappointed. Effischer, great hearing from you and I do trust your opinion. I might just try the Sansui and AR when my buddy gets around to working on them. I don’t think he would mind a test run on my end, since we already did some business together. Frankly, the only Garrard I would ever try is the 301, but I don’t know how transcription tables fair nowadays with DD and belt tables. If I went with the AR, I would mount another tonearm and cart on it.