The best camera straps contour well to your body and are sturdy enough hold heavy DSLRs for as long as you are holding them.

How to use and care your camera strap: Always clean them regualrly, especially if have a leather strap, which need more care.

The best functional camera strap: BlackRapid Sport (basically the mst comfortable camera strap)

The softest leather camera strap: Ona Leather Presidio

The best simple, classic leather strap: A7 Lincoln
 
The best vegan camera strap: Couch Dark Brown Western Camera Strap

Fashion camera straps come with exquisite detailing, amomg other things.

The best fashion straps for cameras: Trillo & Son’s Capa (thickest leather), Hold Fast’s Maven buffalo leather strap (bison leather), Cecilia (soft, best for smaller cameras)