I think that Umbreon is the better shiny and here's why: Umbreon is the Moonlight Pokemon, so introducing a subtle light-blue colour to its rings fits the luminescent and mysterious feel of the moon while staying close to the original design. Zorua on the other hand is the Tricky Fox Pokemon, which is better represented in its original black/red colour-scheme than its blue/brown shiny version. Umbreon is also one of my favourite Pokemon when it comes to symbolism, being the reserved, thoughtful and individualistic counter-part to the extrovert, outgoing and socilal sun and Espeon, which the black and blue coulours reflects really well. (Me and my partner have matching Umbreon and Espeon T-shirts lol hehe)
Cheers
Cheers
"To believe in an ideal, is to be willing to betray it"
VGC, Friend Safari, Masuda
VGC, Friend Safari, Masuda