Ronnie has better taper in the following poses.
- front relaxed
  Yes.
- back relaxed
  No. They are about the same. In the 1998 olympia Ronnie definitley had better taper in the back relaxed round, but not in 2003.
- front double biceps
  Debatable. I thing they are about the same.. Regardless, Dorian has better abs, so it evens out.
- front lat spread
  Definitely not! Dorian's taper was much better than Ronnie's in the front lat spread. Dorian's lats just pop out, whereas Ronnie's are deflated in comparison.
- rear double biceps
  No.
- rear lat spread
  Maybe, but I think it's very close.
Dorian has better taper in the following poses.
- ab-and-thigh
 Yes.
gee, I wonder who has better overall taper. 
  Dorian. 

  Hey, NeoIndian, are you sure that Ronnie has better taper than Dorian in the front lat spread? 

 Even if the back lat spread, I'd say it's a close tie.
SUCKMYMUSCLE