Stick Up Cam Battery vs. Plug In

I recently purchased and setup four Stick-Up Cam Battery cameras for my home, but after placement they are all close enough to an outlet to use that instead. Am I better off returning the battery cameras and getting the plug in ones w/ an extra battery for each, or just getting the power adapter for the existing cameras? Is there any difference between the two models if both of them have batteries and are powered externally?