As others have said, it's primarily going to depend on the players. And let's not forget the rules. That would very well have a significant impact on the outcome.
Judo doesn't focus on leg locks (to my knowledge) that much, so a Sambo guy would have HUGE advantage if you allow leg locks. Sambo doesn't emphasis chokes, so the Judo player has HUGE advantage there.
Beyond rules, it's all individual talent and how studious each player has been.