Doesn't the acura take premium fuel though?
Personally I had this debate also, and a lot of the points have been covered:
-Interior refinement: Acura (hands down)
-Handling//performance: Acura (close call)
-mpg ($): Subaru (regular gas)
-COO: Subaru (repairs should be cheaper)
-Snow: Subaru (this car is amazing in the snow with the right set of tires)
At the end of the day its a close call. If I could afford it, I'd personally get an Acura TL SH-AWD. Don't get me wrong, I love my GT (I know you're looking for 3.6), but I would like a tad more refinement, especially in the interior. Either way, I don't think you are making a bad choice.