Rinnegan was never stated to be the strongest. It was stated to be the most revered. Whereas Sharingan was said to be the most feared doujutsu(including rinnegan).
Amaterasu does not need hand seals.
And the logic in this forum is quite hilarious. Even though people believed that Itachi is stronger than Pain, they voted that Rinnegn\an i stronger than Sharingan. I mean wtf? An ill Itachi with a weaker doujutsu is stronger than Pain? WOW. And they say i am an Uchihatard...
Oh seriously? This is becoming so pedantic. Itachi would get stomped by Pain, but let's say for example, Madara turns out to be stronger than Pain? According to your logic Rinnegan is weaker than Sharingan because sharingan won that imaginary fight?
LOL, ok, now pay attention young squire, this is where it gets tricky...for you.
Rock Lee's eyes> Sharingan. You may ask why I say that, it sounds so ridiculous, right? Well because Rock Lee beat Sasugay when they first met, so this must mean his eyes are the stronger. Oh I know, I know, that's retarded, however, this is the funny part of the tricky part...it is exactly what you are saying.

You're saying that because a sharingan user could beat a Rinnegan user in a fight(according to you), therefore sharingan is stronger? Hopefully you now see how backwards your logic is, experience and other factors would also come into play, it's not like their eyes are jumping out and punching eachother...
Rinnegan is the strongest, Kishi has said so(though I'm sure Uchiha fanboys wish to find a way to twist his words), the very creator and ultimate master of ninjutsu had them, they are literally the eyes of "god," there is no argument here, just uchiha fanboy desperation at its finest. Allow me to humor you. You want to talk sharingan vs rinnegan fights, even though I just showed doing so is useless? Let's talk Sage of the 6 paths vs madara...boom goes the dynamite? Though I'm sure since you're such an uchiha pal, you would pick madara over the guy who created ninjutsu itself and made the...moon? Ok kiddo, when your bias is that obvious in a discussion, the discussion holds no weight.
What is it about these Uchiha fellows that makes some people so narrow minded and laughably desperate? Is it the the cool hair? The apathetic emo attitude? I mean I liked Itachi, sasuke is queer, but I can't understand what makes people go so far to try to paint these clowns out as anything more than the high-mid level ninja that they are/were. What am I missing? Maybe it's the eyes, maybe you think the eyes are cute? They are the window to the soul after all. But Pain had cool eyes too, why aren't you fanobys of him? Or was the circus spin cycle hypnotic flavor alittle too strong for you? And of course byakugan is just wierd with the blankness and vein flexing. I see now, you like their eyes so you make stuff up to make them sound good...well, to each his own.
Did we already do this part? Boom goes the dynamite!