Tallywell.

Blackberries (raw) vs Blueberries

Both count toward 30 plants a week.

Blackberries (raw)Blueberries
Protein · per 100 g1.4 g0.7 g
Fiber · per 100 g5.3 g2.4 g
Energy · per 100 g43 kcal57 kcal
Protein · per 100 kcal3.3 g1.2 g
To hit 30 g protein2143 g · 921 kcal4286 g · 2443 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.