Rosstour
G.O.A.T.
I generally value surplus strategic/tactical smarts over surplus physicality. Nadal was plenty physical in 2019.
Nadal also just performed better in 2019. He won 55.97% of his points (1.44 dominance ratio) compared to 54.98% (1.35) in 2008. I believe it was harder to win tennis matches in 2019 than in 2008 because the overall level was higher, so that Nadal was statistically better in 2019 before adjusting for that difference in level is fairly convincing to me.
I don't think 2008Dal goes down in straights to any version of Djokovic at AO
Lost to Foggo, Stef, Thiem in clay Finals leading up to RG
Lost to 37y10mo Fed at Wimbledon
Not sure man