I think Kiva would win this to. But Momo wouldn't go down that easy. One strength Momotaros has is once he's focused in battle, he's absolutely focused in battle. Like a Kamen Rider Beserker.

Kuuga's base form is Mighty, not Growing.
Ryuki's base form is his Contract'd form, not Blank.
Den-O's base form is Sword, not Plat Form.

Their first form isn't their base/default one.

Very good points.

Still,they're not really base forms.At least Den-O's Sword form doesn't feel like one.And it's only cause he has so many.Like I said,it's like considering Ax,Rod,Gun,and Wing form base forms too.Same goes for Kuuga and his other forms.If Mighty is his base,then so are Dragon,Pegasus,and Titan.I understand Ryuki cause he has one "base" form.Base forms to me are what they start in.Hence the word base.It practically means starting from the bottom.

Mighty is a base form. Growing is a weakned form he goes into when he over-exerts himself, Dragon, Pegasus, Titan, and Rising, are all upgrade forms.

Then that proves my point about Den-O.He doesn't "weaken" or "lower" to Plat Form,its what he starts with.

Okay, let me settle this. I said the form that people recognize the most as the rider would be the one used in the battles. Which form appears whenever Den-O is mentioned? Sword Form.

There we go.

Keep voting people! :D

That's fine,stiil voting for Kiva.:P

I still don't think so.
Plat form is more of an intermediate form, designed for changing between his 4 others.
Designating Plat form as Den-O's default is like calling Kabuto's Masked form his default.

That'll do.
Den-O still owns Kiva. There is nothing Kiva Kiva can or ever has done that proves he can hold a candle to Den-O Sword.

This was tough for me, I like Kiva slightly more I think, but from what I've seen Den-O Sword Form takes him.