First of all, disc brakes are a must for your electric all-terrain bike no matter how powerful your motor is. The benefit to mechanical brakes is they are easy to adjust. Most importantly, you will need to adjust them much more frequently than hydraulic disc brakes. Hydraulic brakes are self adjusting and don’t require as much maintenance. Hydraulic brakes also produce better stopping power with less effort by the rider. Overall, both brake types work well for stopping the bike.