I have used onestep and starsan and like them both.
My thought is that if you are using heat as a final sanitizer, and are rinsing the one-step... you may consider using a "better" clenser that needs to be rinsed to get the full benefit of the cleaning step. However, if you are considering moveing away from the heat step, then keep useing either One Step or Star San (and don't rinse after) and you will be fine.
Good luck!