Plug-in and rechargeable vibrators are more powerful than battery operated vibrators. With electric vibrators you will need to be plugged into AC but you will never lose a charge unless there's a power outage. Rechargeable vibes are also stronger than those using batteries and offer more freedom of movement than electric massagers. You just have to remember to charge your vibrator. Biggest advantage of both types of vibrators... no running around looking for batteries.  Also, many new vibrators can new be charged via USB. In the long run, electric and recharging vibrators do have a longer life and are environment-friendly.