Both rivalries are extremely boring. I mean the Sampras Agassi rivalry was totally manufactured --everyone one knew if Sampras had a decent day he would win. Sampras feared Goran way more.
Fed/Nadal is what the world wants to see.
"I used to be a fairly good tennis player." --Rod Laver. Favs: Goran, Gasquet, Klahn, Seppi, Fognini, Dolgopolov, Nalbandian, Cornet