Direct Drive vs. Idler Drive vs. Belt drive


I'd like to know your thoughts on the strengths and weaknesses of each drive system. I can see that direct drive is more in vogue over the last few years but is it superior to the other drive systems? I've had first-hand experiences with two out of the three drive systems but looking to learn more.
128x128scar972
I use a constrained layer solution on my SP10 MK2  a K-Works ERSA mat made of ERS paper on the plater next is a OEM 1/8 rubber mat and under the record is a Boston Mat 2 all clamped by a Michell clamp . 
@thuchan 
I am curious to what tonearms you have tried on the Denon DP100.
Could you please enlighten us.
Dover,
I am using the original Active Dynamic Servo Tracer with two interchangeable wands,  medium weight in S-shape and low weight in straight shape. It is a kind of Sony Biotracer Arm but really good!
I also use the SME 3012R and the ToXiom.


Sdrsdrsdr,

I am using the Ortofon 309, also with a heavy weight for taking up the Neumanns. And the SME 3012 (I), first version.