No poll, discussions only.
"Story" (made up): AC timeline, the 5 "Gundams" appeared and are superior to every mobile suit in existance up to then... everything? The Stardust Knights can't be having that and call bullsh*t! THE STRONGEST MS IS OBVIOUSLY THE LEO (says they)! Leos are the pride of OZ, their honour must be defended and Roche is the one out to do it!
In their respective stories, Roche and Heero never met, though Roche has shown to keep up with a Gundam *stronger than Wing Zero* in his custom Leo, even to the point of nearly winning (but being the bad guy means he'll get foiled by suddenly appearing help in form of Odin's brother). Given Odin would beat Heero when each using their respective best units (discussed), this should be a fair fight.
Heero in Wing Gundam (NOT wing zero, as mentioned, the Gundams first appeared)
Weapons: Buster Rifle, Vulcans, Beam Sabre
Abilities: Bird Mode transformation
Roche in Leo-S
Weapons: Beam Rifle, Beam Sabre (modified and wielded like a Rapier)
Abilities: None, though it has a huge cape with which Roche conceals the actual stance of his Leo's body beneath it, making it hard even for the best marksmen to get clean hits off.
(Note: in the last now closed thread Roche was mentioned in someone stated he cannot keep his emotions in check and that gives him a disadvantage. Emotions are not a disadvantage and in the actual story, which the poster probably didn't read, it mainly related to his allegiance with OZ and psychological state on Kratz's and Valder's betrayal. Opponents like Heero do not relevantly affect this, especially since Heero isn't likely to speak to him at all, much less betray his trust without prior backstory which is not given here).