Sometimes an idea just seems to work better in a different style. An example for a little project I've been doing on the side since last year (I envision it as an animated cartoon, which will never happen, so thats shy it's just a 'for fun' concept art project xD):
Compared to my webcomic style, which is closer to my "real" style:
I think it's fun to experiment with styles! It's a good way to learn new techniques and develop as an artists ^^ (And clients might want a certain style, so being able to follow a style guide is beneficial, if you're interested in that industry)