Honda hybrids and Toyota hybrids both are able to use both engines at the same time, Before I stated that honda only used one or the other, I was wrong.

Here's how I was confused: Honda's system only uses 1 electric motor to regenerage energy and accelerate (use the energy). The Prius, is able to use 2 electric motors, a larger that accelerates the car, and a smaller one that can regenerate electricity at the same time!