I'm looking at all the himes I gained recently, most from the 1 yr anniversary. I've got 13 SRs that aren't MBL, but I've got 18 SR grails and not quite sure which to use them on. Here's what I've got:

Water: Parvati
Wind: Hermes, Cronus, Maeve, Freja, Krampus, Ithaqua
Lightning: Nemesis, Psyche
Dark: Tsukuyomi, Pharol, Lu Bu [Ren], Meretseger

Which one[s] are most beneficial to MBL?