Which Grand Slam win was more impressive?.

1998 Wimbledon Final: Jana Novotna def. Nathalie Tauziat. Jana beat Nathalie in straight sets to capture her Wimbledon Crown. By winning, Jana erased the memory of losing to Steffi in the 1993 Wimbledon Final.

1990 US Open Final: Sabatini def. Steffi Graf. Sabatini was finally able to beat Steffi when it really counted. It turned out to be Sabatini's lone Slam title.