Didn't read all comments, just want to say what I think.
I pesonally did skyscale because while doing it I enjoyed it for how it is structured, it's long yes but I mainly enjoed, it was relaxing and sometimes fun for me (I stress, for me), but if it wasn't like this, I would gave up and just be fine just with raptor and bunny.
I think it's good to do what you mainly enjoy and if it gives you too much frustration, maybe just do another thing. For example, I don't have griffon, I'm not that kind of player that saves too much money in general, especially for a mount, so I personally preferred skyscale, but it's just an example. The point is you don't have to do everything if it stressses you.