I think easy way is to rate the charaters rather than the actors. Pran in Madhumathi Amjad Khan in Sholay Ajit in Zanjeer and similar movies SRK in Anjaam Amitabh is Ankhen ......
His each role was different one with different style
Infact some times he used to look so handsome that heroes were side tracked - I wonder why heroines used to go after biswajeet, joy mukherjee instead of Pran