Top 10 in TDF: Bernal, Thomas, Kruiswijk, Buchmann, Alaphilippe (!!), Landa, Uran, Quintana, Valverde, Barguil
Top 10 in Vuelta: Roglič, Valverde, Pogačar, Quintana, Lopez, Majka, Keldermann, Hagen, Soler, Nieve
Top 10 Giro: Carapaz, Nibali, Roglič, Landa, Mollema, Majka, Lopez, Yates, Sivakov, Zakaring
For me it's very hard to say. I mean from today's perspective and counting in Roglič and Pogačar, it has to be Vuelta. But from Roglič vs Bernal context, we only need to look at the competition and I think it's still Giro > Vuelta > TDF - just barely... So Carapaz is better than Bernal and Roglič. And to borrow
@Red Rick 's quote: Quod erat demonstrandum