#3 for sure. The design is simple enough to create new assets as needed, it conveys your product concept well, but it does the following too:
- it’s scalable; it conveys the feeling of your full brand in constrained or large spaces
- The idea of dynamic motion is super fun for designers and minimalism is very in.
None of the others offer that, in my view.
#1, Revolutionary stuff: that should be a marketing campaign, not your brand. Your brand image isn’t how you want your user to feel.
#2, The idea sounds nice in theory but I don’t like how it looks, seems hard to pull off.
#4, the water droplet actually confuses me on what your brand is. Looking at your logo, no one would think your product is what it is.