In all photos: Wet n WIld Blue Moon on pinkie and middle; OPI Yoga-ta Get This Blue on index and ring
One of my top 5 OPI of all time is Yoga-ta Get This Blue, which is a deep cobalt with a hint of turquoise shimmer. The effect on the nails is stunning, and in full sunlight, I have yet to meet a dark blue shimmer than can match it. Wet n Wild's new Blue Moon comes darned close, though. When I was perusing their new offerings in their nail range, I picked up this polish as I reflexively do with all deep blues and was surprised when I saw the phantom turquoise shimmer that is Yoga-ta's trademark. I was skeptical that Blue Moon could come close to it's beauty, but for a couple bucks, I figured it would at least be worth a look on the blog for comparison's sake. I was very surprised when they turned out incredibly similar on the nail!
Yoga-ta is slightly less sheer than the WnW, and it's deep and pigmented gorgeousness has a bit more of a purple tone to it. One of the things that I like so much about Yoga-ta is it's happy medium in the blue department; neither too purple nor too green, but putting it next to Blue Moon makes this slight purple leaning more evident. Blue Moon has a bit more of a green tendency. Take these words with a grain of salt, because I really analyzed these suckers in order to give a good comparison. Anyone who's not a hopeless nail junkie will not be able to tell the difference, in my opinion.
Overall, I prefer the OPI's brush, and it looks prettier in it's bottle, but because of the huge price difference and availability, I would recommend trying out the WnW. It makes a great backup for Yoga-ta, and it's a great polish on it's own in Yoga-ta's stead.