Ok, since 98% of the opinions (including mine) are for Shawn, let's break it down pose-4-pose:
Relaxed (front): Shawn
Quarter turns: hmmmmm, this is tough since both have awesome saratus. But this one goes to DEXTER
Relaxed (rear): Dexter
Front double bi: Shawn (sick vacuum)
Front Lat: Shawn (Dexter has high lats)
Side chest: Dexter (sick hams, glutes, quads from side. also has unbelievable bi/tri separation)
Side Tri: Shawn (small waist & great balance)
Rear double bi: Shawn (there are enough pix in this thread to smash the argument)
Rear Lat: Shawn (wide, cut and thick)
Abs & thighs: Shawn (even though Dexter has sick abs, he lacks the thigh separation to win this pose)
Most Muscular: This one is a tie (IMO). Dexter's upper body looks more muscular than Shawn's. But Shawn's legs can't be beat.
Shawn seems to beat Dexter in almost every pose.
But the $$$Million-Dollar question is:
CAN TODAY'S DEXTER BEAT SHAWN'S BEST?
*Note: Dexter wasn't as good as he is today when Shawn was competing.