@dragon_vibe "Why Idler Drive over Belt Drive?" There are proponents of both and in your price range you will get a great turntable, regardless of the drive system.
What you prefer will depend on your sonic priorities and the best advice is to listen to examples of each in your price range and decide what you like (preferably with your Triplanar fitted with your cart, through your downstream electronics, though that will probably be difficult if not impossible, as otherwise you can't isolate the sound contributed by the turntable). Idlers are known for steady timing (lack of pitch variation), good bass and "boogie factor", while a really good belt drive may do delicacy and nuance better. Many prefer direct drive over either, though I have found them a bit clinical sounding (cd-like if you prefer); some will say this is more "accurate" and, be that as it may, it is not my preference but it may be yours.