Personally, I only need three mounts:
  • Spectral Statice for solo travel -- for me, nothings beats its aesthetics
  • Garlond GL-IS for fast travel in new areas and for travel with a friend, and
  • the Regalia for 4-person expeditions
So I don't care about other mounts -- not unless they offer a "mount" that is just Statice's wings on your back, I'd love that.

Tip: having a macro of "/ridepillion <2>" bound to a key takes a lot of the hassle out of riding pillion.