Hi David,
Personally, i think the My Audi app is okay. It tells me info about my car.
Audi connect is different, and i don't think it is worth it. I don't need to know the weather/news, social media updates, etc, as i can see it on my phone for FREE.
I don't think Audi connect includes map updates either (could be wrong). And again, if you have your phone connected using Android Auto, or Apple Carplay, you have FREE maps (google maps, waze, Apple maps, etc).
But i have to say, one thing i miss from Audi connect is 'traffic' updates on the Audi maps/MMI, if i don't have Android Auto connected.
Thanks, Joe