Speedplay VS. Dura Ace????

Looking for opinions on speedplay versus Shimano dura ace pedals. i'm
about a 1:00 40k bike rider for triathlon (5'11, 160lbs)with a cadence
of about 90rpm, and want to know which to buy. speedplay is lighter
and has more float, but seems like a lot of pros are going the dura
ace route. why would you pick dura ace over the lighter speedplays???
(let's pretend price doesn't matter). thanks!