What is the richest Fortnite skin?

I'm curious to know, what exactly is considered the richest Fortnite skin? Is it determined by its rarity, cost, or perhaps the level of exclusivity it holds? Are there any specific features or bonuses that come with owning this particular skin? And for those who are avid Fortnite players, what sets this skin apart from the rest, making it the most sought-after in the game?