So does that mean its better to have one of each? Or does it just apply to Tobi?
he wants both rinnegan and sharingan
Because the Sharingan has certain abilities like Genjutsu that the Rinnegan doesn't so it'd be more logical to have one of each. Also, I think his intangibility comes from his Sharingan so he can't throw away his Sharingan like that.
It might only apply to Tobi. Most characters sharingan don't have any abilities that surpass the rinnegan, but Tobi's sharingan seems to be unique.So does that mean its better to have one of each? Or does it just apply to Tobi?
Likewise, we haven't seen Tobi use very many rinnegan techniques so it's also unknown whether he's able to use them all with only 1 rinnegan.Tobi's sharingan is too just too good to throw away. Besides, as far as we know, no rinnegan tech requires the user to have a rinnegan in both eyes. He just needs the one.