Treating them all as equally well as possible makes sense, to be clear. That means not exploiting or harming any of them unnecessarily.
But treating them in exactly the same way doesn’t, since they have different needs and considerations as you point out. I agree with that.
And I’m not saying we should have all animals as pets, in fact due to the suffering it causes I would be wholly against the domestication of any more animals.
But we don’t have to treat animals in the same exact ways in order to respect and love them equally, even remotely or conceptually, even just based on the knowledge of them. It does feel strange to me to say “this species is my favourite species”. Is it speciesist? I’m not sure. It’s definitely not as bad as exploiting species selectively. But it might have some remnant of the views that led to those practices in the first place, potentially. I’m conflicted about it like another vegan said here whose comment was deleted.