This chapter suggests that Mihawk is to Shanks as Whitebeard is to Roger. I honestly don't give a fu*k anymore who's the stronger of the two.
Mihawk's lack of interest in Yonko's position reminds me of Whitebeard's lack of interest in finding OnePiece. So saying that Mihawk is scared of being a Yonko is like saying that Whitebeard was scared of being the PK.