I prefer the Cloud Serpent than the ugly and ridiculous armored drake. Drake everywhere.
And the MoP PvP set was awesome too, the tyrannical red one (For paladin, black normal one for Horde only) is one of my favorite - combined with the Shadowpan helmet -
For the Prideful Gladiator, i agree that orange is not really "fun", why not a unique one with the same skin as the Sha of Pride (or similar mob) in SoO?
If they gave us a mount equivalent to the mount of the Sha with an armor, it would just be epic !
But they won't change it, why ? Simply because they don't care