Okay, so I've been doing some experimentation with the Lunar wings.
All data was taken via the GPS and Stopwatch in-game.
Fishron Wings (For comparison)
Max Height: 286
Flight Time: 4 seconds
Vertical Speed: 64 Mph
Horizontal Speed: 41 Mph
Solar Wings
Max Height: 331
Flight Time: 4 seconds
Vertical Speed: 77 Mph
Horizontal Speed: 46 Mph
Solar Wings have the best base movement, both horizontal and vertical.
Vortex Booster:
Max Height: 213
Flight Time: 3 seconds
Hover Time (still): 5 seconds
Hover Time (moving): 3 seconds
Vertical Speed: 51 Mph
Horizontal Speed: 34 Mph
Hover Speed: 62 Mph
The Vortex Booster has a hoverboard-like effect. When using that effect, it is the fastest set of wings horizontally.
Stardust Wings:
Max Height: 220
Flight Time: 4 seconds
Hover Time (still): 7 seconds
Hover Time (moving): 4 seconds
Vertical Speed: 38 Mph
Horizontal Speed: 29 Mph
Hover Speed: 39 Mph
Stardust Wings also have a hoverboard-like effect, but they are still notably slow. On the other hand, they also have pretty long flight and hover time.
Nebula Mantle:
Max Height: 331
Flight Time: 3 seconds
Vertical Speed: 77 Mph
Horizontal Speed: 18 Mph (?!)
The Nebula Mantle... is complete garbage. I think the H-Speed is glitched, as it's no faster than walking, and as best as I can tell, the Mantle has no special ability.