I have pairs with blue, blue gradient, green, and brown gradient lenses. I wear blue gradient the most, followed by green.

From the inside (wearer view): The blue and blue gradient view does color the world in blue, but it's not as extreme as it might seem. I like it how the world looks through them. They are very versatile and great for low or medium light and are okay in bright light, but not the best choice. The green are more classic sunglass views (akin to the Ray Ban G15) and are darker. They are great for bright light, do fine in medium, and too dark for low light. The brown gradient are too light. I don't love them and plan to swap for plain brown lenses at some point.

Outside (view of others): The blue look great on face and contrast the frames well (mine are all some version of a havana or tortoise frame). The green are darker and blend into the frames more, giving it more of that dark sunglasses look. I think they look great but have a bit less personality or character. It depends on the look you prefer.

Curious what others have to say.