Board Thread:Questions and Answers/@comment-4319488-20140524163921/@comment-1713281-20140526042051

Vibranium is not the strongest, it can still be warped/dented by certain materials.

Adamantine is not very common in the Marvel world, so there's not a lot of depictions to compare its strengths and weaknesses like you can with Adamantium. However, Hercules' Golden Mace is shown to be as strong as Mjolnir; Mjolnir has dented Adamantium in the past. Therefore, Adamantine is hypothetically stronger than Adamantium.