It all depends on the fight.

3v3 - Kushina > Edo Minato > Grudge

2v2 - Edo Minato > Kushina > Grudge

1v1 - Grudge > Kushina > Edo Minato

Kushina also has an advantage in running Auto. Minato is ok on auto, but Grudge meta can't auto for squat.

The only real "broken" ninjas are gaara healing (should be lowered to 3% or 4%), although it just makes it harder to punch up. And Tsunade immortal, although you can remove her status immunity and put her to sleep and she doesn't get immunity back in round 2. Tsunade should have -50% dodge for all friendly ninja while she is on the field.