It's not a coincidence that during the late 90s Kafelnikov, Rios, Rafter and Moya were considered a weak #1. These players would never be #1 in Roger's era.
I find it funny that Sampras fans even try to counter the weak/strong argument when it's clear that Sampras had a weaker field.
Federer > Davydenko > Nadal > Federer
Nadalgaenger: "Djokovic is clearly better than Pete"