Hydraulic disc brakes will have the most stopping power in any weather conditions, and are standard equipment on most eBIkes because of the added weight and speed on an electric bike, stopping power and stability while braking are important. Not all disc brakes are created equally - the size and quality of the disc (or rotor), as well as the quality of the pad material can have a significant impact on braking performance. Disc brake pads will probably need replacement after 6000 miles, rotors about triple of that. It is recommended to have a front rotor of at least 180mm on speed (28mph) eBikes.
Four brake pistons extend the service life of your brake pads significantly because the distribute pressure and heat more evenly across the brake pads and rotor. They absorb more initial heat and vibration for quiet, smooth operation.