The best smoker uses electric to turn an auger to feed pellets. You'll never get a good smoke ring or bark with an electric smoker. I am partial because I do make smoker pellets. https://winecountry-bbq.com
For long term the Green Mountains can be plugged into a cigarette lighter power outlet in a car to power them. I have a Green Mountian Daniel Boone that I'm very happy with. Just ate a smoked pork chop for lunch.