The choice is not that hard if you actually need an estate/station wagon/touring.
Until you factor in AMG or maybe even Alpina.
I have driven an RS4 and RS6 and found them both capable, but also a little soft and dull. The C63S T, that I ended up buying, doesn't have the same level of traction, but is much more engaging and fun, so I do understand the comments made here.
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2017 M3 Comp Pack 450PS
2017 C63S T 510PS
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