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I really like the first and second just based on design and color. You definitely want to communicate the brand to your audience and simple is good. I think the second one would work best since the color ties in with the aquatic aspect, but the green is cool too. It all comes down to you cause you really have some amazing choices.

I really like it . There are all good , but the first one i think its better, but may be you can change the color of "KIWI" to blue like the other ones, but i really like it.