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Most would argue that the S5 is better. I have only had S4 4-ports myself, so I can't say.
S5 turbo engines should pull harder all the way to the rev limiter - the rotors are lighter, the ECU is newer (faster processor), the turbo will supply more air and the spark plugs are more ideally located. I can't speak from experience, as I really have no experience with S5 4-port engines, I like my S4 4-ports just fine.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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