Tallywell.

Greek yogurt (nonfat) vs Whey protein (dry)

Greek yogurt (nonfat)Whey protein (dry)
Protein · per 100 g10.3 g78.0 g
Fiber · per 100 g0.0 g0.0 g
Energy · per 100 g59 kcal385 kcal
Protein · per 100 kcal17.5 g20.3 g
To hit 30 g protein291 g · 172 kcal38 g · 148 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.