Age could be a factor for Li though. if we are talking of now now like Chan and Li today.. Chan is heaps fit..
Wonder what they do besides katas (personal training), wether they do some good form of sparring.
Who knows, all we know (well most of us) of their prowess's are their collective movie scenes and stunts.
I'd like to think Chan would take more punishment and go the long haul of the fight, whislt Li do some quick damage and
go for the KO. Li has got more mongrel i think... Love to see a proper fight of these two.
No i don't scamper for any information online, or part of some fanclub for these two so i'm basin what i said on my own stuff.