Racer, jitterbug, volcano, watermelon, microvision, which of these short video APP is the best?

Microvision do not understand, jitterbug is suitable for young people, more literary. Racer is a social person, middle-aged and older people and underage volcano middle-aged and older people, but also more love to produce some cooking video and square dance. Watermelon is kind of comprehensive, but it is more inclined to jitterbugs, and there are more young people. This is my impression, there may be mistakes.