If it were me, I'd always look for the CPU with the greatest specifications and the maximum amount of memory since, just like with a computer or a laptop, you want the gadget to work swiftly and smoothly. When I link my vehicle to my smartphone via CarPlay, I utilise the built-in radio applications on my iPhone to listen to live streaming radio. I also have a 4G SIM card in my unit, however you can't use the Wi-Fi in the unit with the data sim at the same time if you have car play going. This is because car play connects to BT via an app called z-link, which utilises the Wi-Fi mode. No one tells you this. I found this out the hard way.