[SloopSloop]

Yeah, no particular order, but my five favorites:

Decade: There's something really satisfying about this one that I can't explain. I think it's the combination of the cards just flying into the driver with a single flick (I also really liked the GoRider card flick, as a side note), the energy cards just slamming into Decade's face, and the way he dusts off his hands, especially when turning into another rider, rather than just striking that rider's pose like most legend rider forms.

Kiva: Never seen Kiva, don't particularly intend to any time soon, but I love the sound-wave aspect to the henshin, and how it breaks apart like glass after.

Ex-Aid: I'm kind of mixed on this one actually, I really liked the little "cutscene" transformations from the early episodes, it reminded me of watching Digimon as a kid. I recognize they slow things down and get in the way of the action, so I don't want to see them all the time, but I wish they still showed them occasionally (I guess Poppy got one in her first henshin, but that was it). The new, Blade-like transformations aren't as fun.

Gaim: Just like what somebody else said, this one is just nuts. Zippers and fruit.

Ghost: Parka ghosts are fun, especially when they fight before fusing with the rider, or dance to the driver's standby music.

My least favorites are probably Drive and Agito, they're both pretty generic aside from Drive's tires.