Choji is only good when paired with Guy. If you are not pairing him with Guy than he is not worth using imo.

Choji works with Guy because Guy has a p@ssive that makes you heal for the amount of damage you do everytime you do Taijutsu damage. So when teamed up with Guy, Choji will heal every time he attacks even with combos, and with his basic attack the heal is actually pretty good because he attacks a entire row, which is especially useful against clones.