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More pistons doesn’t equal better braking for a street car. The more pistons you have the smaller they are to keep the same overall clamping force on the pads.
Bigger calipers with more pistons exist so the pads can be larger and the force can be evenly distributed over the larger pads. Offsetting the clamping force to the trailing end of the pad with different piston sizes can also help mitigate tapered pad wear.
The effective rotor diameter and the brake pad coefficient of friction have much more to do with the stopping power of the brakes. Increased rotor mass and larger pad area is for increased repetitive stopping power, as there’s more mass to absorb and more surface area to reject heat.
Stock brakes with aggressive pads will have far more stopping power than my upgraded brakes, but my larger brakes will stop consistently more times without overheating. 90% of the brake upgrade was cosmetic, for me anyway.
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