Both have well established procedures to care for, so with attention either is readily doable. clowns need more food types tho as the babies mouths are smaller when you have to feed them, you need phyto and rotifer cultures. cardinals on the other hand need baby brine to start, which seems easier, to me anyways. i see more people doing clowns so i think cardinals would be more interesting. if you are doing this for profit though, you are thinking of it for the wrong reasons. dont plan on making money at it.