CDbaby versus Tunecore single song digital release?

I want to release a song. I am more interested in getting the music out there/heard than the money I make. I know there is a $10 annual fee free Tunecore. And for CDbaby I think it's a $10-$15 one time fee, which seems more appealing but I know unlike Tunecore, CDbaby takes a cut of the profits. Anyway, does anyone know which one of these is better to use for a single song digital release?