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A lot of it depends on the preference. I own Tanabe Medallion Touring exhaust for my IS 250 AWD and for me personally, it has a deep bass tone and is quiet once you're at speed. I do like the sound of the F-Sport which is much louder than the Tanabe.
^ ^ ^ Yup, it is all up to your own personal reference. Search around the forum for sound/video clips of people's setups. Best way is to hear it in person.
Youtube videos most definitively do not give exhaust notes justice. But other then finding everyones car and their different setups how can you pick one =P
Myself i'm running f sport intake and exhaust and ppe headers and it sounds amazing.