ABB is definitely the most glaring NA omission. And I blame the FBB for that... I find it hard to complain about the other species I'd want because they aren't particularly common in zoos outside of the US (river otter, porcupine) and/or they're pretty niche (burrowing owl, black-footed ferret).
Interestingly, when birds inevitably enter the chat in PZ2, I would really hope that our rep would increase because of all the raptors!
They're both gorgeous in their own way! I just figure that if we get one, the other could be effectively modded into existence. I plan on commissioning that day 1 if they're in the pack, TBH.

Regardless of which sub-species we get.
Regarding the Hamadryas baboon versus the gelada, I think Hamadryas is an "okay" rep for highlands that was higher-requested, more recognizable than the gelada, and would be (theoretically) easier to craft. The fur on the gelada is pretty wild and would likely be trickier to pull off. So when you take all of that together? It can see the justification.
The tree kangaroos are both probably the exact same amount of energy. But I could see them opting for Matschie's over Goodfellow's based solely on the appearance. More copium...