WELCOME! to the forum.!
EPR is a comfort feature, You can try it to see how well you do with it, some people like it and some don't. Hang in there for more responses to your post and much success to you with your CPAP therapy.
I tend to see EPR as "bilevel junior". It offers up to 3.0 cm H2O "pressure relief" on exhale. Well, in my book, that is bilevel and presents the need to consider the exhale pressure (EPAP) that maintains the airway against obstructive events, and allows the inhale pressure (IPAP) to address hypopnea, flow limitation and RERA.
Bilevel titration is easier than you might think. A CPAP pressure of 10, means that 90 percent of the time, 10 cm is adequate to prevent obstructive apnea. Using EPR is NOT just comfort; it actually drops your EPAP pressure to 7.0 and may allow obstructive events to occur. It's okay! If you enjoy the comfort of pressure support (the difference between IPAP and EPAP in bilevel), as most of us do, just increase the CPAP pressure until obstructive events are no longer significant.
What this means is you may be able to leave CPAP pressure at 10 with EPR at 3 for comfort, but if you experience significant OA or H events, you will need to increase the CPAP pressure until those fade away. You could end up with a pressure of 13 (EPAP 10/IPAP13), or you might tolerate the prescribed pressure without events. However EPR does fundamentally change CPAP titration, and as long as you understand it, and respond appropriately, you'll be fine as well as more comfortable. EPR is limited bilevel, which is why Philips Respironics limits AFlex and CFlex that only provides 2 cm pressure relief max. There are other differences, but I think the Resmed approach can be very comfortable, and it addresses the comfort issues that make some people fail CPAP and makes them need more expensive bilevel.