Not sure if this is weird of me or not, but I base my worlds on what "theme" I'm going for. Sounds silly, but if you want more of a western, warm toned, casual facility, I'd go for a world that includes those tones by using certain trees etc. If you want more of an elegant cool toned world, go for a world that has cool toned grass, trees, and vibes :3 such as pine trees, or redwood dawn trees. Catch my drift?
So to sum up, It really just depends on what look you're going for! Hope this helped <3