I'd honestly take the job to at least 60 and run some content to get a better idea of how it plays outside of leveling to get a better assessment and see if you want to continue to use it in SB. Fun Scaith and the warring triad can still provide some difficulty for PUGs.

If you like healing specifically, both SCH and AST provide additional gimmicks that might make things more interesting. All in all, it isn't too difficult to level a job to Max, or go back to it if you decide to level something else. Play them all and see which you enjoy most.