I'm pretty sure the basic comcept behind them is the same, but the higher the Category is, the better quality the cable is i.e. it can transfer at higher frequency/speeds, or go longer distances at lower speeds without losing signal. Where'd you find CAT7? I didn't find any CAT7's in Canada.... I'd suggest you go with the CAT7 if you want to future-proof your network for faster speeds like 10G, unless you're happy with 1G.