I would want to know how the factory version is installed. I have the impression from youtube that the factory version is basically installing a valve in the existing loader control block and adding hard hydraulic lines to the loader, but I am not sure if that applies to all models. (Also, I think the factory loader control arm already has switches and wiring so you just connect the factory wiring. But I would ask to confirm this is true for your specific model, because I don't know.
For the aftermarket kits, I'd want to know if they are using hard lines or hoses, where the solenoid block will be mounted, how it connects to the hydraulic system and how you wire it to the loader control arm.
I would lean towards the factory version if it truly integrates into the system rather than using an add-on unless someone could persuade me otherwise.