I know you might not reply back but, should I add knowledge?
If it was Tsunade with knowledge of Sasori's poison and prep, I'd say it could go either way, since she'd coem equipped with the antidote. If Sakura hadn't made some then she and Chiyo would have never made it past the Kazekage puppet.
In a straight fight, Sasori wins with mid-high difficulty.
@DarkScarecrow: even if he gets suigetsu out, the admirals are experts at both types of haki not including kings haki. which means they could sense him out. Aizen controls the 5 senses not their sense of haki