We have 2 FCA vehicles. Both with UConnect 4C NAVs.
Mine is a Jeep Cherokee, but the operation of the system is basically identical with our Pacifica.
Personally, I would not be without CarPlay (or Android Auto if I had an Android phone).
The functionality of CarPlay and Android Auto is very similar.
There are multiple advantages to using your phone's NAV functionality.
1. Maps are more up to date.
2. Voice recognition is much better via Siri or Google Assistant. I can almost always use Siri on the fly to input a destination, and it comes up with the correct location. Using the Uconnect... often the POI is not in the database, or even if it is, the car tells me "I didn't understand that. This is a big advantage because you cannot to keyboard input on the Uconnect while in motion.
3. Text messaging is better. U connect is good for incoming messages, but you cannot reply using an iPhone. I have read that some Android phones will allow replies over Bluetooth. For both CP and AA, you do need to be connected via usb.
4. You have more choices of NAV apps. Waze is a good example. It does a better job of re-routing.
My Wife rarely uses the Car Play functionality because she already understood how to use the Uconnect. One problem, sometimes she reverts to grabbing the phone to text. Not good! One of the reasons I forked over $$$$ to trade to the Pacifica was to get the improved tech so she'd stop grabbing the phone to text. When I'm with her, I'll remind her that even without using CarPlay, she can long press the VR button and respond using SIRI, after getting the incoming text via Uconnect.
Perhaps you can get your dealer to assist with a demo. If not, search YouTube to get a better idea of how AA works.
2018 Pacifica S Limited
3.6L V6 Gas