Ultimate Majins are defensive buffers - they give you buffs to strengthen your defense.
Grand Chefs are offensive buffers - they give buffs to make u stronger.
People prefer Ultimate Majins over Grand Chef's in duengons & tmq's...both of the classes are fun to play so its up to you :).
even the offensive buffs from ultimate are better then the chef's cause they increase both defense and attack by 18% and im not talking about the base stats , im talking about the final damage which is much better.
100