###A Mecha Aurelion Sol made by a fan
https://i.imgur.com/Gs7mtPo.png
or
###A Mecha Aurelion Sol made by Riot
UPDATE: Not sure why I am being downvoted for asking a simple preference question... I wasn't trying to imply that Riot's skin is bad.
Fan looks more like Project than mecha. Riot's mecha fits the mecha theme better
Aurelion Toy
Yeah the fan one looks more Project mused with Arcade then it does Mecha. Wrong coloring and that armor fits those more that Mecha.
I actually really like Riot's Mecha ASol. The fanmade one is great too, but I think Riot's colors and design are more unique amongst skins. The fanmade one reminds me of Arcade Hecarim, which is a skin that I love, but doesn't exactly make Aurelion's skin stand out.
Riot's version is, IMO, the better Mecha skin. It fits the Mecha aesthetic with sharp, defined angles that make it look like a machine, not something organic.
Additionally, removing A/Sol's legs and tail-tip (or, at the very least, replacing the tail tip with a visual effect) make it look like a jet flare effect coming from his back-end.
Like most everyone else said, the fan-made skin looks more akin to PROJECT: - while it does look fairly mechanical, it lacks the defining angles that appear on Mecha skins - Mecha A/Sol's head looks vaguely like a dragon's head, but the fan-made one is made distinctly to look like a face.
The armor-plating on the fan-made skin look less designed to be the hull of a vehicle/mech, and more like they're meant to be body plating, and the stylistic design (primarily silvery plates with dark gray/black underbody, neon effect colors) does move it more towards PROJECT:, especially with the triangle designs placed on the forehead and shoulders.
And, lastly; The big, feathery crown does not fit into the Mecha skin line. Mecha is a skin line for purpose-built giant robots, with the barest minimum of non-functional design. I.E., a paint job. The crown, alongside the tail-tip, both look far too natural to fit into the Mecha skin line.
So, again; Fan-made skin looks like PROJECT:, Riot-made skin looks like Mecha.
Fan mecha asol looks more like an arcade skin 
