Largely the texture. Marinara tends to be chunky and has a runnier consistency. Pomodoro, on the other hand, is thicker because it simmers uncovered and blended until completely smooth. Marinara also tends to contain more herbs, other vegetables, and spices, like oregano or red pepper flakes. The ingredients can also vary widely based on each person’s pantry and preferences. Marinara sauce is more often made with canned tomatoes rather than fresh.