Cap's shield can't be more durable than Mjolnir. It was put to the test when King Thor hit the shield. The shield rumpled, and Mjolnir did not crack even slightly. To drill this point in even further, the shield was improved with the same substance that Mjolnir is made of after the Serpent broke it.
So currently:
1. Mjolnir/Cap's shield (post augmentation)
2. Pure Adamantium
3. Cain's Skin with forcefield.
Mjolnir has been damaged too many times, it's been even affected by heat:
http://s388.photobucket.com/user/OneDumbG0/media/Mjolnir01.jpg.html
Originally posted by Stoic
Cap's shield can't be more durable than Mjolnir. It was put to the test when King Thor hit the shield. The shield rumpled, and Mjolnir did not crack even slightly.
Originally posted by riv6672
I'd have to see Cap's shield somehow molded into a hammer wielded by King Thor strike an uru shield the same thickness as Cap's to be convinced.
On panel evidence as it is, has proven that if Mjolnir were to strike the shield with sufficient force, that the shield would buckle without damaging Mjolnir. It has also been accepted that a being as powerful as the Serpent could destroy the shield. It is what is is I guess. When Uru was applied to the shield, it was considered an upgrade and not a downgrade.