Let's start with the silvers. To compare to FNUG Psychedelic, I grabbed GOSH Holographic Hero (which like the FNUGs is in my stash thanks to mrsrexy), Dance Legend T-1000, and Color Club Harp on It.
Here they are on the nail, indoors, in the same order as the bottles above:
And here they are in the sunshine:
The slightly blurrier photo below highlights the differences I saw among these. The GOSH is the least holo (this newer version does not live up to the original GOSH Holographic). The FNUG has the smoothest most complex rainbow, while the Dance Legend is a bit less refined and the Color Club a bit less than that. Still, the Color Club holds up well against its expensive cousins from overseas.
I'll finish off the silvers section with a couple different angles taken in the sun:
Moving along to the light green category, I have FNUG Fantastica, Layla Jade Groove, Urban Outfitters Green Holo, and Color Club Angel Kiss.
On the nail, the differences in the base colors shows up more than it did in the bottles. The FNUG is most yellow-leaning, and the Color Club is nearly blue. Here they are indoors (again in same order as the bottles):
In the sun, all of them have rainbows; I think the FNUG wins, though, as its rainbow seems to have more colors. The Layla takes second place.
The greens in the sun from a different persepctive:
Wrapping up with the light blues, FNUG Futuristica took on Layla Mermaid Spell, Color Club Blue Heaven, and China Glaze Sci Fly By.
On the nail, indoors, the first three show hints of rainbows while the China Glaze (from this past springs Hologram collection) just looks like a metallic-leaning shimmer.
In the sun, the disparity continues. The FNUG busts out the most beautiful rainbow, with the Layla not far behind and the Color Club not far behind that. The China Glaze does look more colorful than it did indoors, but compared to the other three, it's not at all eye catching. The OMG collection proved China Glaze can do great linear holos; they just haven't their last two tries.
The blurry shot below was as holo as I could get the China Glaze to look:
I'll finish up today with a few more shots of the blue rainbows in the sun:
I haven't done the math so I can't prove it, but I believe the Color Club ones win in the dollars per rainbow category. FNUG wins in colors per fingertip.