WHEEL SIZE DOES NOT MATTER IF YOU HAVE GEARS!
You want to faster just shift up geez! Even then if youre fixed just get a bigger chainring,or smaller cog.
Use 26x1.5" tires they are great.
26 MTB wheels usually have wider hubs and smaller spokes making them stronger and more durable. Why would you want 700?
IF the gears are too easy for your monster quads, put a 53 tooth chainring in the front.