Based on your question, you want to know whether moon cakes, roast duck or beer is a better gift to give to the elderly during the August 15th festival.

In Chinese culture, August 15th is the Mid-Autumn Festival, an important traditional festival. According to traditional customs, the choice of gifts should be in line with the atmosphere of the Mid-Autumn Festival and the preferences of the elderly.

1. Moon cakes are one of the traditional foods of the Mid-Autumn Festival. Therefore, giving moon cakes to the elderly can express respect and care for them. Mooncakes have a wide range of flavors and fillings to choose from, including traditional flavors such as lotus paste, bean paste, five kernels, etc., as well as some innovative flavors such as chocolate, snow-skin mooncakes, etc. You can choose the flavor that the elderly like, or choose some healthy and low-sugar mooncake styles.

2. Roast duck is one of the representatives of Beijing cuisine and one of the traditional Chinese delicacies. If the elderly like to eat roast duck, it is also a good choice to give them a delicious roast duck. However, it should be noted that roast duck is a meat product, and the elderly may have some digestive concerns, so it is best to find out whether the elderly have dietary restrictions or habits before choosing to send roast duck.

3. Beer, as a drink, is usually used as a way to celebrate at festivals or parties. However, according to traditional Chinese concepts, the elderly are usually not very fond of or not suitable for drinking. Especially for older people, drinking alcohol can have negative health effects, so giving alcohol away is not an appropriate option.

To sum up, based on the Mid-Autumn Festival tradition and the preferences of the elderly, I suggest you choose to send mooncakes as gifts. Of course, the most important thing is to take the interests and health of the elderly as the starting point and choose a gift that expresses your feelings and meets their preferences and needs.