Overall
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PC wins. Why? Mods!
I received GRAW for my b-day in June; I'm just now getting around to playing it. I spent about an hour after install picking & choosing amongst the mods on ghostrecon.net, installing and then uninstalling the ones I didn't like (the 3rd person mod looks cool but just isn't very practical).
Kept:-
Reduced Sepia
Reduced (Clean) HUD
Blood Mod
Special Forces Skins
Playing at 1680x1050 16x AF 55-60 FPS
Athlon 64 X2 4800 MSI K8N Neo4 SLI
BFG 8800 GTS (oc'ed) Audigy 2
2 Gb PC3200 (1 Gbx2) Gateway FPD2185W 21" Sony MDR-V600 Cans
I'm a graphics-whore, so there really is no comparison for me