750 is good. According to the Query Life Network, Y751 uses wall-breaking technology, which has a fuller and more delicate taste and low sound. B1 uses frequency conversion technology, which has a relatively delicate taste and relatively loud sound. The two are better than the 750 wall-breaking machine. Joyoung's wall breaking machine is a wall breaking product independently developed by Joyoung. It is the first hand-washable wall breaking machine independently developed by Joyoung. It is the first to apply frequency conversion technology to wall breaking machine products and continues to lead the development of the industry. Joyoung is a national wall breaking machine. Participated in the formulation of standards and has been the sales champion of wall breaker for seven consecutive years. He has 1,000 plus valid patents for wall breaker and 10 plus valid awards for wall breaker.