I think it may not be enough for a four-year-old to choose Du Yaya and listen to Niu. Because children's English enlightenment is not only the active function of listening and listening, but also interaction. Children must learn to speak English, otherwise the learned dumb English will definitely be eliminated by society. I knew Du Yaya before, and I used the recently popular AI technology to enlighten children's English by talking to them in English and simulating American education. So I feel that Du Yaya's learning machine may be more suitable for you to buy as a gift.