Ursack or BearVault for Beartooths?

Planning some time in the Beartooths later this summer. Trying to decide between Ursack or BearVault. Concerned that there won’t be a lot of trees to tie Ursack to up around the alpine lakes. Some trip report photos I’ve seen show areas that are just rock and snow.

I know a BearVault can be rolled away, but I can easily imagine an Ursack being picked up and carried for a long distance/total hiding.

Recommendations?

Thanks!