Which part of the sentence functions as an adjective? the infinitive phrase “to heartily enjoy”
the participial phrase “bubbling its way”
the gerund phrase “hiking along merrily”
the prepositional phrase “beside us”

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 !

choices ? or is this a actual question from yourself ?