In practice my MX blue switches are slightly quieter than my mouse buttons. it is the bottoming out, that you will get with all MX switches, that is much louder.
I like the blues for typing, and have a keybaord with browns on order. I also have one with blacks, but that is a lot stiffer and I get the impression that my fingers would get tired quicker if I had to type on it all day.
If you are going to be doing a lot of typing, a switch with a tactile bump (blues, browns) would probably be best, as you could train yourself to stop pressing when you feel the bump (about half way down the key stroke).