I made 15000km with my base stingray manual last year.
Today i have 2500km on my zzzzz auto.
My base car was very very comfort, and my z is nice to. I daily drive it and it very pleasant to do.
I really love the manual transmission of my 2014 and i not loving tath much at this time the a8. The fun factor of manual is very exciting and i miss it. It why i have a z07 2016 on order for next spring with 7 speed REV MATCH! But it a personnal taste and you cant make bad descision because it really a fantastic car all around.