madara has showed to use a tech(meteor) that is on much higher power level than a similar tech from nagato. This is due to him being closer to the sage him having uchiha+ senju dna. Exp isnt everything in naruto, naruto for example has a BM that is so much better than bee's, sasuke learned how to use sussano and all its form in one battle and used amaterasu as a shield in that same battle. Geniuses can learn to use techs very fast, sasuke and even naruto later on are proof of that and this is MAdara we are talking about of course he knows how to use his own eyes well to certain degree. Even though he doesnt have as much exp his techs are on another level comapred to nagatonagato would actually beat madara on a good day. hes lived with rinnegan his entire life so hes mastered it on a much higher level than madara, skill wise, even if madara has raw power. plus he has rinnegan techs madara doesnt like the animal path summonings, rinne tensei, and king of hell.
nagato would flank madara and try to trick him into false security then blindside him. madara wouldnt know whats going on and nagato's battle experience with rinnegan would prove crucial.
And even kabuto who is one of the most knowledgeable person and has access to both of their powers in the series considers him to be stronger and calls him the trump card not nagato for a reason. Put the pieces together which a lot of nagato fans clearly cant do