Do bigger rotors stop better?
Also asked, are thicker rotors better?
Thicker fins allows the manufacturer to produce a less expensive rotor because the surface that does all the stopping, the machined surfaces, can be made thinner but the replacement will still have the same discard thickness as the OE rotor even though the life expectancy can be severely shortened.
Likewise, people ask, do bigger brakes stop a car faster?
A big brake kit will not increase the stopping power of a vehicle or decrease its stopping distance due to the physics involved. A larger brake pad will only spread out the clamping force of the brake caliper over a greater area.
The front rotor is bigger because you CAN brake more with the front before losing traction. The rear rotor is smaller because a whole lot of extra braking force is just going to make the wheel lock up anyway, so a bigger rotor would just be a waste.