Purchase the DJI, it has features that the cheap ones do not offer. It will shut down when your car battery starts to get low about 12.3 Volts, this will save you from having to jump start your car.
It will shut down when the battery is too hot and will not charge until the battery is cool enough, and if the electronics in the box start to get hot it will shut down. It will also shut down if it senses your DC port in your car has a high resistance connection that is heating up. ( neat safety feature).
Don't expect the unit to charge if your car is not running, it may or it may not depending on your car battery.