I generally use Eos over Selene, and her heals are quite powerful. Rouse + Whispering Dawn is amazing, buff up her heals with Fey Illum as well. Though the thing is Fairy is not solo, you have Fairy + your shields. With Noct, you have noct + no fairy. You lack:
- Crit shields
- higher potency shields
- Instant Cast AoE heal
- Deployment of large shields
- Eye for an Eye
- Regen of any sort while in shields
- Fairy healing (about 1/3 of your heals if you are using Whispering Dawn and heavy healing encounters like Seph Ex, otherwise 100% of your healing cuz u dun need to heal)
- Sacred Soil 10% damage reduction that can be cast and allow you to actually do other stuff such as move, deploy shields, succor, dps and so on
- Shadow Flare, AoE slow
Without the above, the shields of Noct just seem weak. Diurnal is the way to go