woah woah dog I never said who the obvious winner was
But you do raise a fair handful of points. I definitely haven't watched enough Kabuto to know exactly what goes on with Hyper form, but my line of thinking was Decade turning himself into Kabuto and using Attack Ride Illusion to put numbers in his favor. It seemed to work for him in All Riders vs. Dai Shocker, but that film was mind poison anyways.
Plus, he could use Clock Up outside of being Kabuto in Movie Wars 2010, so he has a number of other Decade advantages like Invisible and Illusion there. Still doesn't negate Hyper Kabuto, though.

Tough call... if it weren't for OOO, Den-O, All Riders: Let's Go Kamen Riders! Ichigo.

I'm voting OOO. I genuinely believe OOO is one of the (If not the) strongest Riders of all time.

OOO all the way. He would hands down beat Ichigo. As much as the original Rider rocks I just don't think he would stand a chance. Too many different forms and abilities that he just wouldn't be able to defend against.

Anyone else think that matrixbeast has become the 'Sentai' of kabuto due to this thread? =p

I guess it makes it easier going forward for the likes of OOO etc though if Kabuto's not around, silver lining and all that.. =p

I think Den-O and Matrixbeast covered everything i wanted to say, so yep I'm voting OOO too.

OOO has a huge advantage in how varied his fighting styles are.

Ever since Decade's movie (Where he gained the ability to drop the IQ of every Rider in his vicinity by 100 points), I've been completely anti-Decade.

But here's the thing: OOO and Kabuto are legitimately more powerful than Decade. But Decade is riding the "Hurr durr evry rider" wave, getting him a free pass (In addition to many people having Decade be their first Rider experience, similar to Gokaiger for who are now Sentai fans).

Having the powers doesn't make him any stronger than the others. Decade as Kuuga could kick a monster and it'd die. Kuuga could kick Decade and wipe out a city. But NOPE. Decade is stronger because Decade is Decade. Decade as Kabuto can move at super speed. Kabuto can FREELY STOP, REVERSE, AND ALTER TIME. But NOPE. Decade is better because Decade is Decade. OOO is fueled by desire, and once Eiji realized what his true desires were and tried to obtain him, he became nigh unstoppable. But NOPE. Decade can beat him because Decade is Decade.

Let me tell you who Decade is. Decade is the 13 year old anime fan's cliche ridden, 'perfect', "Original" character who got elevated to legitimate character. Decade is a nobody. How does he solve his problems? By figuring out who to copy next (Gokaiger was even worse in this regard, since at least Decade didn't start with all the powers, we got to see him fight, but I'm not gonna get into that). His growth amounts to "Stop being a colossal dick for no reason," and the only reason he still exists is due to a BS deus ex machina involving his inexplicable girlfriend (Who would do anything for him because...Love) killing him then convincing the Riders of other worlds (Whom he just went on a killing spree against) that he was worth remembering and reviving (He's also the leader of the villains too, giving him a super powered evil side).

Who is Kamen Rider Decade? Kamen Rider Decade is just evidence that, yes, Kuuga, Agito, Ryuki, Faiz, Blade, Hibiki, Kabuto, Den-O, and Kiva can, in fact, still kill monsters when a bad cameraman in a stupid haircut can't handle it.

....and breathe.

Yeah, I get what Matrixbeast is saying. Decade could have every single weapon & power-up Kabuto has, but at the end of the day, no-one is better at being Kabuto, than Kabuto.