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Brushed or Brushless
Electric motors are categorized by whether they use brushes to deliver electricity to the moving parts of the device. Brushed motors are significantly cheaper than the brushless; however, brushless motors require little maintenance and deliver up to 300 percent more power.
Stock vs. Modified
Brushed motors are further divided into two classes: Stock motors, meaning that they aren't intended for any modifications or upgrades by the user, and modified motors, which offer adjustable timing, ball bearings and are generally much more powerful than their stock counterparts. Modified motors usually require the use of an electronic speed control (ESC), as they need a circuit that can support their heavy power load. Without an ESC, a high-energy modified motor could permanently damage the battery and eventually warp the chassis, as the overburdened circuit heats up.
Brushless Motors
In a brushless motor, the brushes once responsible for delivering electric current are absent. In their place, brushless motors have copper wires attached to the inside of the motor's can instead of the rotating commutator, meaning that the physical connection of a brush is no longer necessary for magnetic induction. By eliminating these brushes, there is less friction, and fewer parts are needed to deliver and maintain superior performance.