Well, there is no need to get down to small details - Kai is better in bold strokes - he is bigger, better conditioned and has better aesthetics.
Phil's MM and FLS are ridiculously lousy for super HW, it's so obvious he tries to look bigger in these poses, but can't due to genetic flaws. Not with these clavicles and girly ribcage.
Aesthetically Phil is better, and has been.
Kai has a wide torso, and his waist is wide, sad that back in 2006-2007, he never looked like that. He has too much muscle for his 5'8 frame.
At this point and level, you have to focus on the small details, as that is what separates them.
You can't use broad strokes, because you have focus on the details---the devil is in the details.