R8 -- more comfy, better interior, naturally aspirated sound, turns more heads, doesn't look as dated as the 997. MR > RR. But its very slow by todays standards. power and weight of an e92 m3.
997 - better performance, few bolt ons and you've got well over 500whp. larger aftermarket support and community.
I'd probably go R8, if no v10 at least get a supercharger for the v8.
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