Personally for an inflator, I would get something like this little guy:
Why? Because those ones that plug into the cigarette lighter won’t fill the tires as fast. And because you want to be inflating your tires in the morning after the car’s been sitting overnight (because after you drive on them they heat up, which increases the pressure, and the psi rating on the door frame is cold psi). So since you’re inflating them in the morning before you drive, you’re home anyway, so the cigarette lighter inflator isn’t necessary.