All you can really look at in this general of a question is stock vs stock. You could make a moped beat a stock Banshee if you modded it enough. The Banshee really isn't that quick right out of the box but it responds VERY well to mods. So, as stated earlier, stock vs stock the 700r would take it, and so would a few other quads, but start adding performance parts to the Shee and it will soon end up on top.
IMO, if you put the SAME amount of $ into each quad, the Banshee will end up with TWICE the power of a 700, 450, 400, ect.
I have around $1100 into my Shee's motor including labor and it dyno'd close to 64hp, I don't think a 700 could touch that.