Board Thread:Naruto Discussions/@comment-29378291-20160731031505/@comment-1018594-20160731045552

You can't really compare the two because they're functionally different. Susanoo's bones are strictly for defense while Kimimaro's bones, which can be used for defense, are mainly an offensive weapon.

Susanoo's bones are ethereal in nature and we've seen them broken on multiple occasions. Kimimaro's bones have been said to be sharper and more durable than tempered steel. However, as I've said, you can't compare the two because they're used for completely (actually, the opposite) different reasons.