User blog comment:HQDominator/Quest for the Best: Six Heroes Omni Evolution/@comment-26555200-20161026191804

Opinions do matter to the person telling them, but there is no BEST six hero. Each one was made specifically for different uses for example:

Selena&Atro:Healing/Status Cleansing

BB and overall support

Vargas&Eze:Nuking

Offensive and supportive buffs

OTK's

Lance&Magress:Defense

Survivability

Basically these units are actually meant to be used together for an ultimate team along with other units, i.e. Atro and either Vargas or Eze combined will aid you with Offensive buffs since all three of them boost Atk by 150% and BB support considering Atro's BB efficacy buff, Vargas's BB fill every turn buff and Eze's BB fill during spark buff etc. So in short the Six Heroes don't have any BEST units rather they are meant to be used with others or the heroes themselves.