both situations, I play music local to the device through the head unit. I don't stream music, but I will stream podcasts.

since CarPlay got Google Maps and Waze, I've been using the iPhone WAY more since I don't have to also use an iPod.

Android Auto is absolute assjuice for playing music -- because they want you to Google Assistant everything. it's been this way for 3 years.

If I'm not in my own car, I use a Scosche Bluetooth FM Transmitter and just "Air AUX jack" phone audio.