There are days I'd love a manual just for total control of the gearbox, faster to react to your inputs etc. In an S3 it'll feel great. If I took it to a track then I'd want the manual just for fun.
But 90% of the time I'm happy with an S-Tronic. (I'm 28...but I'd like my left knee to work when I'm 60
).
The real question is...would you like Audi's clutch? I personally hated it...with a passion. The problem I find is the clutch pedal it too high, and the biting point is too high which puts un-needed pressure my non-double jointed ankle. Also why does the pedal need to have so much travel to reach the floor when the biting point is that high? Makes it feel weird I found.
I think a sportier clutch would do wonders for the manual option - one that's lower down with far less travel. Literally like a clutch on-off switch.