This one will be very interesting..
Many people say that Zidane has only proved his worth at Real with world stars. (3 CL titles are 3 CL titles though...)
Pochettino, Tuchel or Emery were often blamed for not being able to handle big egos at PSG. Well, Zidane has experience having Ronaldo, Ramos, Higuain and co. in his team, and probably even the biggest stars have lots of respect towards him. Also will be fun to see him coaching Messi.