well I do really think that it is still too early to decide just on a mere demo ... lets wait for Crysis, Conan or Halo 2 and we will see ..... even nvidia hasn't finalised its drivers for vista .. so how can one justify the difference just on analysis based on a demo
Supreme Commander is one the best RTS I have ever played, haven't got my hands on C&C 3, looks promising, though Total wars expansion is on my must have list
wdmalik's comments