User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-26347196-20161019124446/@comment-26983351-20161021134028

Is depend on sp enchantment on for what u use it, yes they both grant barrier,heal, cure status.

But consider this Ark cure status on BB, heal after finishing atk.

Ark Granted ATK BUFF+OD fill, Very usefull leader skill, hig sbb dmg

If it my ark i granted him add elemental+elemental negation

While ELimo grant 2turn Mitigation, Def&rec buff, dmg tken restore HP. < elimo heal is very usefull for hp scaling sbb, the con is no damage but is fine cause the main reason u use elimo is for hard content>

to complete defense i will take atk/def red,ailment, critical negation

is not rare for omni evos clashed each other role but the most important is what to fill the role that class cannot do So I think what u feel is exactly right.