It’s all subjective, but beyond staves and some magical weapons, I found the glow effects detracts from the aesthetics of most weapons as well as character skins.
Like for Brettonian Longsword, the best looking skin that fits the Grail Knight aesthetics is Evengleam. And for the moments where a weapon glow can be pulled off, it’s almost always the more subtle light blue glow.
The rare times the purple glow worked was when a weapon is equipped to the Necromancer or Shade.
Overall I wish the game chose to make more different designs rather than resorting to making weapons glow to show rarity.