I say this as someone who likes to mod their cars, but I think the A7/S7 probably come out in a wash.
I originially went with the A7 out of fears of the transmission in the S7 (which as I see now are a little overblown and manageable). Kind of my thing was I didn't want to have to be removing the engine and transmission.
Well, my car needed timing chains, which luckily I didn't pay for, and after running around 40k in san antonio heat on stage 2 my cats started disintegrating and I had sold my engine lift to do mounts and cats (although in theory I didn't need it for my cats) which set me on about a $2300 mission to make my exhaust not sound like shit. Plus I can't run full E85 like the v8 cars... not sure if that interests you at all though.
I understand that I have had earlier failures than many people, but they are looming on the horizon depending on how you use your car. I am the type of person that will get out infront of a potential failure though. I could have probably gone 20-50k more miles on both my cats and my timing chains. The only thing that has caught me off guard was my alternator and a coolant solenoid (knock on wood). If I had to do it again, I would get the S7, but that is just me, a guy on the internet, giving advice which is worth exactly what you pay for it.
I've still had to do control arms, wheel bearings, and motor mounts which are issues common to both cars.
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