What class of amplifier has the most high definition sound ?

Class A wins

sacresta OP
Ok guys, my question was focused in experience and sensitivity to pure sound.

"Pure Sound"?? Class-A OTL tube wins, with heavy proviso's on what they can drive. After which come Class-A solid state, which can drive most things if good designs. 
SET and all other tubes are governed by their output transformers, they are not "pure in sound" and have colourations.

Cheers George

To win, you:
 
1. can't have an amp with crossover distortion (sorry class AB)
2. can't have an amp that isn't linear & has an output filter (sorry class D)
3. can't cheat and use a bunch of feedback to lower distortion. (sorry class AB & D).

What we are left with is Class A solid state for accuracy (pure sound?) and tubes for adding those lovely harmonics that give us that deep and wide sound stage, extra decay, and rounded notes. 

I would say it somewhat differently - tubes presenting harmonically correct soundscapes.

I would say it somewhat differently - tubes presenting harmonically correct soundscapes.

Only Class-A OTL's, anything with an output transformer is hamstrung.

Cheers George