The GoGo V suits had the gas mask thing inside, and we could actually see the actors inside them quite a bit, which might have been a pain to constantly switch between Takaiwa and Nishioka But hey, it was super realistic.
I have an extreme fondness of the Maskman, Jetman and Gingaman suits. All three of those had awesome suits.
Dairanger and Timeranger were also very cool. They fit their themes perfectly.