Probably a little bit firmer, but both were an equally soggy stock set up. Might be a little more fun to throw around the S15 I must admit, the seating position is also lower on the S15. But the Skyline is does feel alot roomier - the S15 felt a little claustrophobic to me, the interior space was probably on par or less than my previous car which was an N13 Exa.