I like Koa ukuleles because they are the "traditional" wood that Hawaiian ukuleles are made from, they are beautiful, and the two that I have sound really nice.
I also have two ukuleles made from Milo wood, another traditional Hawaiian wood, usually used to make calabashes and especially to`ere, the polynesian log drum. I really like the sound of the Milo ukuleles, lots of volume.
I just got a Kamoa GC-700 that is made of Tiger Maple. It rings and rings, you can actually hear like an echo or overtone effect while you are playing - remarkable, and I don't think any of my other ukuleles do that, or certainly not to the same degree as the maple.
I say of YOU like the way it looks and the way it sounds, then it is good for YOU!