Wasn't very easy to find, but here are the differences between the 3 key types:

>Linear switches, colored red, are the smoothest, with no tactile bump and little noise.

>Tactile switches, colored brown, have a little discernible bump and little sound. It would be the one closest to a traditional typing experience you find on our MX Keys keyboards.

>Clicky switches, colored blue, have a discernible bump and sound. They are the loudest of the three switch types.

https://support.logi.com/hc/en-us/articles/5216332313495-FAQ...