Count me amongst the Roach disciples, I can't get enough of this cat! I first heard him on the Ike Quebec dates and at the time my initial reaction was "too roller rink". I had assumed that he played in that style all the time. (Don't get me wrong, I love his playing on those records now). Then I heard Mo Greens Please and realized I was quite wrong.
I don't bother comparing one artist to another anymore, so I won't try to rate Roach amidst all the other organ players of the time. He just delivers this "oh so easy" soulful, bluesy quality that just CANNOT be faked, you're either born with it (Turrentine, Blue Mitchell, John Patton) or you ain't. No pretentions, no bullshit...just groove.
I like all of his recordings (I even dig My People, Soul People). I'm not sure about being able to pick favorites, but I guess I'd lean towards either Mo Greens Please or All That's Good.