Don't get hung up on just ER. The ER measurement is only part of the equation. The shape, size, and design of the eye cups plays a role as well.
The only way to tell what will actually work best for you is to try them out for yourself.
Completely agree, if you use eyecups. I never have/do even when wearing contacts I never use eyecups, just rest the tops of the oculars on my eyebrows give or take.
