welcome to the forums..
hope i can help out a bit -
the engine layouts are 2.oT / 3.2
the 3.2 is a V6 - non turbo.
I would lean towards the 2.0T if your interested at all in tuning / upgrading
you car performance / engine wise...
not to say you couldnt tune the V6 - but just to begin w/ your platform is tuner-friendly. (chip etc)
I also think option B is better bec. of the lower miles / lower interest etc. etc.
and the tuning options.
hope that helps out a bit.
use the search function when u can - thees tons of info in the A4 section.
if u cant find an answer -post it up in the A4 section - lots of knowledgeable people over there.
good luck on the hunt -