Tallywell.

Halibut (cooked) vs Cod (cooked)

Halibut (cooked)Cod (cooked)
Protein · per 100 g22.5 g22.8 g
Fiber · per 100 g0.0 g0.0 g
Energy · per 100 g111 kcal105 kcal
Protein · per 100 kcal20.3 g21.7 g
To hit 30 g protein133 g · 148 kcal132 g · 138 kcal

Bold marks the better side of each row. "Per 100 kcal" answers the density question — which food delivers more protein for the energy it costs. Portion row is computed live from the same USDA base values shown on each food page.