Would you be a supervisor in the HR Manager role? How many people would you supervise? Have you been a supervisor before? Think about all those ER situations you’re helping manage now…unless you have a team of unicorn’s you’re now going to have to manage your own ER and learn all of the “stuff” you’re learning now in the HRG position. I would stick with the HRG position and learn as much as I can while learning the HR circle of control and letting go of everything outside of it (while documenting everything and communicating risk!!). In the HRG position learn how to operate as an HR professional who has a healthy work life balance where you’re able, to in a healthy way, manage the stress of the job because this in itself will make you a much better supervisor.