So, while there's the obvious difference (one's matte and neon, the other is shiny and creme), there are a lot of similarities between these two gorgeous colors: Four Leaf Clover from the latest China Glaze collection "Up & Away" and Turned Up Turquoise from... (any help here, ladies?). Here's a swatch of the two on nails:
Four Leaf Clover is a little greener (still pretty Turquoise, but definitely greener than TUT), shiny without topcoat, and has no shimmer. Turned Up Turquoise is matte upon application and has a slight shimmer.
Personally, if I were forced to choose one (thank god I'm not!), I'd go with Turned Up Turquoise... right now. I'll be swatching FLC tonight and wearing it tomorrow, so I'll make my big judgment call then.