Which pokemon is better between cascoon and silcoon?

The only thing that differentiates them is that Cascoon evolves into Dustox and Silcoon evolves into Beautify. Everything else about them is identical.

Neither of the evolved forms are really great from a competitive aspect, outside of use in certain PvP Cups. Dustox, for example, was a strong choice in Twilight.

Absolutely none man :/ its just a dex filler tbh their evolutions are probably among the least helpful pokes in the game.