I'd say get them both in due time, and figure out which one you like best. None of them, in my opinion, is superior to the other.
I think the griffon is more suited as an aerial mount, as I want to be able to fly to cover _long distances quickly_. When the Skyscale runs out of stamina (which it will if you try to keep your altitude), it goes down just like the griffon - but with way less forward momentum. And the small gains in altitude on short distances can almost always be achieved with a springer, too.
In short, the scale to me feels like a swiss army knife of mounts - longer "jumps" than a raptor, decent maneuverability, sufficient speed bursts especially with the masteries... really handy, yet sometimes you just want the perfect tool for a specific job.
**But**, MacGyver wasn't famous for his giant toolbelt... So pick your favorite :)