Which 5* should I rank up or should I wait....

Salt_Doll · October 2018

All are unduped. I'm trying to choose wisely since at my level of play/dedication it will take a while to rank up even one 5*. I feel with a bunch of maxed out 4*s I'm ready to take the plunge... I'm looking more towards event quests and story quests at this point in terms of where I need the most help. In terms of my 4*s I have a pretty good mix of utility. Thanks!