Just like to add also that bigger brakes = more rotating mass. Which COULD = longer stopping distance depending on other factors.
Also, just like to add that a good example is bigger isn't always better is Formula One. The surface area of the rotors is actually really tiny, and the calipers aren't overly huge either, actually not much bigger than a Subaru 4 pot front. Technical regulations limit wheel diameter to 15". Also the wheel bearings on them are really large, hence the small clamping area. I should find a picture I took of the 2008 Mclaren front wheel+brakes. The rotor surface is also slotted, but not in a conventional means. The slots move vertically from the centre of the rotor outwards, and the rotor looks like it is comprised of blocks aranged in a circle.