Which of these could be a main idea? A. The typical birthday dessert is cake and ice cream.
B. Some parties have piñatas filled with many types of candy.
C. Birthday parties for young kids can be fun.
D. Many kids want clowns at their parties.

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !