Tallywell.

Lamb loin (cooked) vs Ground beef (90% lean, cooked)

Lamb loin (cooked)Ground beef (90% lean, cooked)
Protein · per 100 g25.6 g22.0 g
Fiber · per 100 g0.0 g0.0 g
Energy · per 100 g258 kcal176 kcal
Protein · per 100 kcal9.9 g12.5 g
To hit 30 g protein117 g · 302 kcal136 g · 240 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.