My experience with both street Evo's (4,8 and 9) and STI's is that EVO is much better in handling, more precise on turns, better front grip (less understeer compared to STI) and overall a better, more efficient and very stable car. STI is more fun though as on gravel you have to throw it more sideways while EVO just turns and goes. Couldn't believe how much grip I had with street car on street tyres when driving an EVO on gravel though. On icy lakes STI's were no match to the EVO's no matter who drove them. And I'm talking about purely street cars.