I have/had both pairs... and honestly I like both pairs about the same.
I had shanes (very soft) before the d2's and thought I would hate the stiffness, I loved them... then got a pair of Floyds and also love them.
I feel the 2 laces give you a "tighter" feel, but either boot is better than anything else I've ever used.
I epecially dig the Floyds at the cable -- quicker on/off and more flex for pressing stuff
but between those two its a win win... and getting the inner ankle harness (they may have done away with them) really adds/subtracts stiffness...