you should use them on grimm. his attack is higher and his cosume bonus is really good, so then he would be a great tank.
Grimm is very powerful. His costume is good also. But mine is maxed, limit broken, +20, and has the costume bonus, and his defense is still only 677. He is not, and never will be, a tank. If you need a tank, do Gormek.
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Grimm Is really good to have and great for titans, I would do Grimm over Gormek