The taste difference isn't from muscle size. Predator flesh tends to be darker, coarser and gamey from high nitrogenous waste and lipid oxidation. Carnivore diets include secondary compounds like amines and fatty acid derivatives that add strong odors. Prey animals have a milder, sweeter flavor and tender texture due to lower metabolic by-products and more stable lipids. Slow twitch flesh tastes better than fast twitch flesh.