Gotta go with Kuuga's. It's odd and not very fancy, but I love it.

Oh man. So many good, catchy sound effects from this series. If I were to make a list of my favorite sounds:
-Henshin: Despite all of the flashy, stylish henshins, I'd have to give it to Hibiki. It's subtle but iconic in how it hightens up, leading to the signature "TAH!", and I don't think any other rider, save for the other Hibiki riders, managed to quite imitate it.
-Weapon: Literally anything from the Barizun Sword. Coolest weapon we've gotten in a while.
-Finisher: Close tie between Punch Hopper's Rider Jump and Blade King's Royal Straight Flush.

Shabadoobie ! :lol

Going on a hunch here and saying that Kickback's favrioute is Shabadobadabi. :lol

These right here. Warning, extremely loud


http://www.youtube.com/watch?v=Z2eAlW1iBPY

You went with OOO? Imma shocked :lol

Do we have a video with all the henshin sounds? I don't know enough to give an educated opinion.

My favorite right now is Double's, but Fourze's comes a close second.

Youtube might.

Double's CycloneJoker henshin for me, though I also love the OOO Jingles, Kabuto's Zecter noises, Fourze's techno, and while it's not a henshin sound the background music that plays when Decade henshins.

Gotta say W (and to a lesser extent, Skull's) is my favourite, but really ALL of them generally have some cool/goofy effect that makes the henshin effect something to get pumped for.

Some favourites:

AAAAAA--MAAAAAHHHHH--ZOONNNNNNNN! Because back in the Showa Era, you could just . . .yell really loud and transform, I guess. It's pretty simple, but effective.

Blade smacking Decade with the "TURN UP" part of his henshin pose.

And man, I really do like Wizard's "Shabadoobie" henshin and all the goofy musical stings that come with his form changes.