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Since Mars is much larger than the Moon and made of similar materials its gravity must be stronger.
Weaker.
Because Mars is a lot less massive than the Earth. The surface gravity depends on the mass of the planet you are standing on, and since Mars is lighter the surface gravity there will be less than here on Earth.The gravitational force between two objects depends on their mass and the distance between their centers of mass. Mars has a smaller radius than the Earth (which would tend to increase the gravitational force), but it has a much smaller mass than the Earth (which tends to decrease the gravitational force). Combining the two factors, it works out that the surface gravity of Mars is about one-third that on Earth.
It isn't clear what you mean with "stronger or weaker". Neptune's gravity is stronger than that of Earth, if that's what you mean, since Neptune has a larger mass.
The weight of the bag of sugar on Mars would be about 0.38 times its weight on Earth, due to Mars having weaker gravity. On Jupiter, the weight of the bag of sugar would be about 2.53 times its weight on Earth, since Jupiter's gravity is much stronger.