Hi KenT140D,
I have used both on my Sprint on and off in the last three years.
It comes down to the tyre profile.
ie. on a Qualifier I felt like it slowed the steering, but only slightly
On Pilot Powers, Battlax BT 002 Medium race and also Michelin Pilot race medium tyres I feel the 190 is better and do not notice any noticable lack of turn in speed.
My 2 cents worth.
Sorry I can't speak for the S3 as I havent owned one.
DaveM
