Meh. You know you could've added that to your post, you know, something like "If you(A paladin), are in a group with another paladin and a druid, and the other paladin uses Might.. do you cast Kings or does the druid cast MotW?"
Not all raids have multiple paladins.
As Blazto above me said, you didn't say in your post "in a 25man raid" or anything. So I just assumed you were the only Paladin.
People whine more about lacking kings, therefore mark is the superior buff. Plus, epic gear is purple, mark is purple, therefore mark is an epic buff.