Tallywell.

Kidney beans (cooked) vs Black beans (cooked)

Both count toward 30 plants a week.

Kidney beans (cooked)Black beans (cooked)
Protein · per 100 g8.7 g8.9 g
Fiber · per 100 g6.4 g8.7 g
Energy · per 100 g127 kcal132 kcal
Protein · per 100 kcal6.9 g6.7 g
To hit 30 g protein345 g · 438 kcal337 g · 445 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.