all three are real nice. as much as i despise S9, thier higher end stuff, and that board included, are pretty nice.
S9
bamboo deck, tracker trucks good wheels. BUT its a sector9, wich automatically, especially around a college campus, has newb-vibe. fine if you can jam around, bad if you cant ride and have crappy style.
Madrid
good boards, its fiberglassed, so the flex is gonna be snappier and more resiliant, more durable. truck brand? good wheels. the fiberglass is nice, but your rarely (ever?) on the middle of a board that size anyway, so flex isnt too crucial of a component, but itd be durable, say it gets run over by a car or something, itd prolly survive.
the GFH is in my opinion a more fun shape, specially for a mini. its got a kick too, and i personally prefer the narrow tail, it allows you to wrap your foot over it and really crank your kickturns. i dont think its QUITE as nice a deck as the madrid or s9, and the componentry is all GFH (really, thats fine on a board like this tho).
personally, id go with the madrid or the GFH. the madrid is the best deck outta the three, but i personally prefer the shape of the GFH. if you really just like the aesthetics of the bamboo s9, its a nice board too.