Tallywell.

Canned tuna (in water) vs Chicken breast (roasted)

Canned tuna (in water)Chicken breast (roasted)
Protein · per 100 g25.5 g31.0 g
Fiber · per 100 g0.0 g0.0 g
Energy · per 100 g116 kcal165 kcal
Protein · per 100 kcal22.0 g18.8 g
To hit 30 g protein118 g · 136 kcal97 g · 160 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.