More than enough information on the "help" site below, to confuse any buyer to the point of not knowing what to buy.
https://www.carcamcentral.com/
The important thing is to write down the features you consider important to you, and measure each model according to the desirability of the feature.
Clarity of the image under varying light conditions is crucial, as you want to be able to read number plates clearly at all times.
Length of recording, or additional memory capability is also important, as you don't want to have such low capabilities that the camera runs out of recording ability at a crucial moment.
Ease of operation is also critical, you don't want to be trying to remember complex commands and procedures, and having to refer to the manual constantly.