Which is better, the chalk live class, Forrest Gump's landing theory or the net splitting class?

I think it may be better to record the class than to broadcast it live. Some live lessons are really watery. Forrest Gump and Bai Fenjian's online classes are recorded and broadcast classes, and the price is much lower than that of chalk. But I haven't used Forrest Gump's, and I have occasionally seen it in the little red book and Zhihu. I used it last year. The teacher is very good, with clear thinking, clear expression, easy to understand and good voice. Secondly, the curriculum, from knowledge points to topics to skills, is connected in series through mind maps, with clear ideas and available learning; Then learning is very convenient, with its own APP, high-definition videos can be learned and cached anytime and anywhere, and you can also learn to brush questions in your spare time. I just bought it at random. Have a try. Who knew the effect was so good that I went ashore at once. However, it seems that Fenfen Chop is not famous. Perhaps it is a pity that it didn't spend too much money on marketing.