I remember a while back when I was still on the fence about Eos vs Selene during T6. My party's DPS was low'ish and the 3rd bee kept transitioning into the final phase. (Never fun)

After 2-3 wipes (they didn't understand to stop DPS on the boss and I couldn't tell then because of the language barrier =/ ), so I decided to try Selene at this point. We were able to skip the 3rd bee entirely and the phase transitioned smoothly. ^^

Switching to Selene was one of the best decisions I made, in terms of raiding of course... =)