I had a 2010 S4 manual and went through the same upgrade desicion process exactly years ago. Ultimately chose a 2015 RS5 over the S6 and no regrets here. Have posted these thoughts before but here is a quick recap.
1) I didn't need/want a big car so back seat wasn't a consideration
2) The S6 is a nice looking car but it doesn't compare to the RS5 in the looks department (and I'm a sedan guy)
3) Performance wise the S6 is a stronger engine than the RS5 based on the "testing" my buddy and I did but its pretty close
4) The S6 dominates the RS5 in terms "tech", if that's important to you you may find the RS5 lacking
5) RS5 v. S4- These are two totally different engines. The low-end torque on the S4 is amazing and makes the car feel super fast for everyday driving. The RS5 is a totally different animal- at low RPMs it's pretty sluggish so you have to be prepared to keep it in Sport mode or paddle-shift it to keep RPMs at ~3500. Really comes down to personal preference and driving style.
Both are great cars so you can't go wrong, just a question of priorities. Good luck!
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Rs5 by
dylanjh, on Flickr[/IMG]
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DSC_9629 by
dylanjh, on Flickr[/IMG]
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