rate thes in order of best prep, 1 being greatest

thanos,darkseid,dr doom, brainiac,batman

Thanos :1
Doom: 2
Batman: 3
Brainiac: 4
Darkseid: 5

Thanos conquer 3 times the MU, with preps, wich is why is nickname is the Prep King.

add lex luthor and grand master to the list to make things a little more interesting.