Welcome to the forum Ben, you'll find the members on here are a friendly and helpful bunch 🙂
I'm not surprised your excited to collect your new Audi's! 🙂
if it were me I'd take the TT, but one of your deciding factors is now much luggage you're taking.
i did a road trip last year in my a6 to France and Belgium and had a great time 🙂
cheers
Steve