How would you rank the companions on a tier list?

[Ereson]

The 6 Companions are:

1. Companion Battie
2. Companion Mort
3. Companion Rib
4. Companion Shady
5. Companion Fidi
6. Companion Antos

How would you rank them on a tier list from S tier all the way to F tier? I've only really dabbled with Companion Rib, so I don't know how well they do generally.

[Puzzlemint]

Battie when you want to stomp, Shady when you want to farm a tiny bit of extra darkness, Rib when you want to cheese Erebus gates, Mort/Fidi/Antos when you want to roll with Mort/Fidi/Antos