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It all comes down to looks. Both of them are made by HKS (correct me if I'm wrong about the F-sport) I believe the F-sport is a little quieter than the HKS. Google "Is250 F-sport exhaust" and "Is250 HKS high power exhaust" and you decide!
^ I thought the same too with the canisters and huge plain tips. Is the HKS louder than the F-Sport anyone? I'm wanting an exhaust in the future to pair along with the Invidia Midpipe and want the most sound possible.
hks is great and also the F sport
but once you put a mid pipe on either of the exhaust they are bloody loud
i prefer the greddy over the 2 very nice and subtle
gorgeous sound