Originally Posted by
GavinWilliams
Yep. The fit leaves me with the L or XL I'm right in the middle, hence the question. "With all other rhings being equal... "
If you had the same fit on both, you would be in an identical position. You OP suggested that the two sizes would give you different positions.
If there is an ideal, it's the bike that requires 20 of headset spacers and a 100 to 120mm stem.