What is the Quality differences in micro cassettes?

A mini cassette was used in transcriber machines. It is a bit longer in length than the micro cassette, but the same height. The reason I know this is because I have transcribed from both sides for doctor's office, beginning back in the 1990s. The mini was never used for very long. Kind of like the beta and the VHS tapes for video recording. VHS won out over beta.