The difference between sata3 and m.2 hard disks

The SSD of SATA3 interface is cheap, and the bandwidth of M.2 interface is large. 1 and m.2 are almost the most expensive SSDs with the same capacity, and sata3 is the cheapest. 2. The bandwidth of sata3 is 6Gb/s, while the bandwidth of m.2 is at least 10Gb/s and at most 32 GB/s.3. If the SSD transmission speed is not greater than 550MB/s, if the bandwidth exceeds this bandwidth, M.2 will be used.