I have 3 now, Argi (Bad choice I know, but it's a spacegoat), Anubisath Idol, and Fossilized Hatchling. Should be getting another level 25 boost here today, so I'm contemplating what to use it on. I did catch an Unborn Val'kyr last night after 10-15 minutes searching, so potentially boost that? But it would feel a bit wasteful given she's already level 20.
Are any of the new 6.1 pet's worth using/boosting? I like the Fragments but am fully aware their kit's a bit repetitive outside of Fragment of anger.