I AGREE! Sampras had a much better serve, net game and could hold his own against Andre with ground strokes. Watching their USO matches prove that.
It was pretty funny that Agassi could never beat Sampas at the US Open. He was actually the clear favourite to win all 4 of their matches there. Failing to beat his biggest rival at the tournament he cared about the most, must have irritated him.
It wasn't really a case of fast vs. courts slow hard courts either, because I'm pretty sure that the US Open organisers slowed down their courts in the early 90s to favour mainly Agassi but also Courier and Chang (many other players commentated on that). On the other hand when Agassi beat Sampras at the Australian Open in 2000, the courts there were playing incredibly fast that year (faster than the US Open courts that Sampras beat Agassi on in 1995, 2001 and 2002).