2.4 GHz has a longer range for better connectivity if you are a ways away from the router. 5GHz is potentially faster, but the signal drops quickly as you move away from router. You need a good signal to get the really fast speeds. I connected mine with 2.4GHz for stability of the signal. Not a problem at all. Plenty fast enough. If you have a good signal at 5GHz for your car, use that. Otherwise the 2.4 GHz is fine.