If I could boil it down, my favourite tracks would be something by the Heptones or The Gaylads or Carlton and the Shoes or Ken Boothe or The Wailers or Delroy Wilson or Slim Smith or Alton Ellis. They would all be Studio One.
But they'd have tough competition with tracks from The Impressions, Irma Thomas, Etta James, Aretha Franklin, Sonny Boy Williamson, Howling Wolf, Fats Domino, James Carr, Bobby Bland...
They'd all be from the 60s, that's for sure.
In the end, for me, it's all about voice, harmony and rhythm.