Gaining

I'm really confused about the difference between these two, which one is better for gaining? I'm bad at reading food labels but half and half seems to have more calories usually than heavy cream.

Heavy cream has the most calories with 100 calories for 2 Tablespoons,
Half and Half has 40 calories for 2Tablespoons, and Whole Milk has 19 calories for 2 Tablespoons.

For gaining purposes Half and Half is a good and versatile milk substitute (it’s half milk and half cream). Some people don’t tolerate/like heavy cream very much. But it’s great to add extra calories to many dishes and drinks.