21 Gemstones... 2 Hextech skins OR maybe 21 chests?

Hey all, Since gemstones were added into the game and thanks to this lasts missions and gifts, I managed to get a total of 21 gems. At the beggining I wanted 10 for the Soustealer Vayne but honestly she has other skins I like more. So in your opinion, would you get 2 hextech skins now (or wait for an hypothetical one that you might enjoy) OR would you rather get 21 masterwork chests and hope for the best?
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