The Nissan 350Z, is faster by far than the SC400s. The SC400 in the mid 90s had 250hp, and the late model SC400s (97-00) had 300 hp. Although the later models had 300 hp, they are significantly heavier than the Z.
Now in terms of better features, like luxury, handling, features, etc, the SC400 exceeds in luxury and features. The SC had heated seats and very nice sound systems. The Z comes with very basic features. The handling on the Z is; however, is much better than the SC.