There are only few "mechanical" switches which attempt to not be as much noisier over membrane than typical mechanical switches.
Cherry has that MX Silent, Logitech Romer-G and Topre with its rubber dome and capacitive detection.
Because of that rubber dome as major component Topre would be likely softest in its noise.
https://deskthority.net/wiki/Topre_switch#Internal_components_.28Capacitive_switch.29
Half dozen years ago when trying different Cherrys in shop there was also Topre keyboard, but now Topres aren't available here in Finland, so can't say how it relates to these others.
Though if you would like illumination Topre is completely "dark" switch. (and still very expensive)
MX Silent is variant of MX Red, which is very light linear switch.
So its feel would be entirely different to membrane, which has highest resistance in upper part of travel with press registered only during bottoming.
Instead there would be very little feel before actuation point leading easily to accidental presses from resting fingers on keys.
Romer-G is non-linear switch with some resistance in start of travel.
I've myself used it since winter after nearly five years with MX Brown.
Should have switched earlier with sharp "clickety-clacketyness" of undamped MX Brown.
Have read some saying it being close to membrane in its feel.
