Ryuki.

I'd say OOO.

Ohhhh tough call, both are great in their own ways. You want happy fun and powerful? Go with OOO. You want dark, depressing, and suspenseful? Go with Ryuki.

Hey Den-O, you seem to be the Rider Expert. Help me decide, OOO or Kiva?

I'm far from an expert my friend but I'll happily make suggestions. Between OOO & Kiva it's a tossup again. I think OOO is great. It's got a lot of variety for the heroes forms & powers, the villains are pretty interesting (especially Maki), and the ending is manly tears worthy. Great designs all around for OOO forms and for Birth. This show should be on anyones' watch list.

Kiva (despite what the haters will tell you) is a pretty good show once you get outside the single digits. Wataru starts off pretty timid and sheepish, no more so than Ryutaro from Den-O in my opinion. By the end of the series he's easily one of the most powerful riders out there. He's significantly more powerful than the other riders and the villains in his show. It's got a good cast of supporting characters even if the last couple Fangires are pretty weak. Otoya makes that show worth while if you can't find anything else to redeem it. Which I think would be highly unlikely.

I was about to say the Movie War 2010, but gncannon already did, so...

OOO, I hear Ryuki is depressing.

Crap, they both sound so good!... Well, in times like this I look at the music. What does Kiva have, Tetra-Fang? "Listens to Tetra-Fang"... SOLD!

I'd personally rank them as about on par with each other. I'd probably say go with OOO first, though, because Date and Ankh.

If it's OOO vs anyone, just pick OOO. It's such a great series!

Good man. I'm on episode 15 right now, and I'm loving every minute of it. I don't think that Wataru is as (for lack of a better term) wimpy in the beginning as Ryotarou was.