A splitter's hydraulic ram does all work, but the pump that sends it the fluid it needs to work must be powered by something. In this case, the obvious advantage of an electric motor is they run silent and can produce an incredible amount of torque in a small size. Unfortunately, they need to be plugged in, which means working next to your house or in conjunction with a generator. You can operate gas models anywhere, but also have the added upkeep and noise associated with an internal combustion engine. Of course, you can still grab a maul and do it by hand if you prefer.