Both both today.
First off of course we adress the elephant in the room. The figures. Crap. Sculpt and costume designs MIGHT have been nice with decent articulation. Only thing salvageable once more are the heads.
tldr: If you're into vehicles for the figures, forget it.
GIMMICKS. The Wheelblaster has what may be the most pointless action featurein GI Joe history. It's front wheel fires off. WTF. Its launched by pulling back on the bike whjile pressing down and a middle wheel fires forward, launching the front wheel and taking its place. The gimmick is a bitch to activate with mine.
The Ninja Speedcycle has a basic pull-back motor and fires a missle. comes with clip on sword holders which attatch to the handlebars. Two rubbery swords are included. Hope you dont live in a particularly hot region. Because they get flimsy when warm. The ninja clan emblem would limitdisplay potential unless you paint over them
So the important question is: Can RAH figures use them? Yes. Portunately the handlebars are small enough not to stretch out a RAH figures hands too terribly much. The legs however may be spread out too much for us to see as viable for display thanks to the internal gimmick mechanisms. THe Ninja bike looks better with a RAH figure than the Wheelblaster. Both bikes have wide wheels so they stay upright in your display easily.
tldr: I suppose theyd work for display purposes, but there are much better Joe motorcycles out there. Would really like to find another one of those RoC Ferret remolds some day.