Lmao summons are irrelevant, and all Orochimaru has to do is fight in a way where he won't need to make too much eye contact. Gunbai is irrelevant unless you show a chakra based attack that Orochimaru uses that Madara can actually reflect, and Madara's speed is irrelevant. Meanwhile:
-Madara has no conceivable way to actually put him down, it's a million times worse in S1 since he's limited to Katon, Gunbai and a scythe.
-Madara has no way to block or overpower Eight Branches in S1 or S2, nor can he take it down. Susanoo adds that defensive power, but Madara w/ MS drawbacks won't outlast Orochimaru. Not to mention Hydra going at V2 Susanoo with multiple hits at full power should eventually get past Susanoo.
Restrict Eight Branches and Madara would beat Orochimaru in both scenarios.