6 paths abilities, 5 elements(6 if you count that other one), quick mastery of the techniques at your disposal, Creation of all things, and enables you to create other techniques and perhaps use any non-KG(excluding Uchiha and Senju) technique available if you happen to learn them.
Though technically, Rinnegan is the evolved form of the EMS so Rinnegan would give you both.
both are awesome, i would want it like madara, switching from ems to rinnegan and backward
He didn't switched at all, we've saw madara using susanoo without switching rinne from EMS, we know also that EMS evolves to the Rinnegan, idk but i do think that a fully mastered rinnegan may have SOME EMS and Sharingan features
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