Hi David, congrats on the new car! I'm no expert but I believe the quicker the charge rate, the more damaging to the battery it can be over time. I am currently charging using 110v outlet and the original charger the car came with and I'm a happy camper. If I know I'm not going anywhere for a day or two, I'll even enable the option to run the charge at half the rate.
Battery management is actually a complicated topic, you can't leave the battery below a certain charge level for too long or it'll suffer, you also can't leave the battery over a certain charge level for too long or it'll suffer as well. The idea is to keep it at ~50% charge when idle and charge it up to 100% before departure.
The departure scheduling settings in MMI combined with the Audi charger will bring your battery up to a healthy charge then stop and resume once it gets closer to your scheduled departure time. It's quite a confusing system if you don't know what it's doing and a lot of people actually consider it broken since there is very little literature. You'll even find people saying the charging issues started after a dealership visit, my humble opinion is that Audi released a software update after they had to recall a bunch of batteries and replace a bunch of batteries under warranty to reduce the failure rates.
I know this is probably more information that you wanted, but I got to rambling a bit. Congrats again, enjoy it!
