Switching breasts isn't as easy in a ring sling. You'd have to take baby out and switch the shoulder the ring sling is on. I use this more for quick nursing sessions. But for longer ones where you want to feed on both breasts, a two-shoulder option like a meh dai or wrap would be my choice.
You would need to take the sling off and put the rings on the opposite shoulder. Ring Slings aren't the easiest for switching breasts in the same nursing session. Older babies might be able to get to both but for smaller babies you would need to switch shoulders.