Which Turntable would be better?

BTW, I have a Thorens 160 with an SME III arm. But I prefer the KD650 with the stock arm.

Thank you for the input.

I haven't done any research yet on a suitable cartridge. I believe the one on the TT now is an old AT Z100.

The preamp is a Kenwood Basic C2 and the amp a Kenwood Basic M1 into a pair of Dayton Wright LCM-1 speakers.

BTW the Linn Basik is mounted on a Honduras Mahogany base rather the the plastic covered plywood that came with the KD500.

I love those vintage Kenwood tables. I would keep it. 

Keep the turntable, it is an excellent player.  I used to sell the KD500 and also the same but with a Kenwood  "S" shaped arm.  I owned the latter one.   When moving from one home to another, it fell off the back of my Toyota pick up.  I was in the road crying, as I picked up all the pieces.  You will never get the same PRAT  with a belt drive that you get with that Kenwood.  It's a timeless classic.  I would upgrade the cartridge and perhaps the phono stage.