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I have several keyboards and the "mem-chanical" (a hybrid membrane/mechanical) is quiet loudy and clicky. I have had to occasionally telephone IT and I hear them typing loudly down the phone when they are talking to me. I also don't like the noise of mechanical.Mechanical keyboard IMO are gimmicky.
I've never had an issue with membrane. I use membrane at work as office supplies us with them and I've never missed a keystroke.
They are also loud and I mean LOUD.
I have 2 mechanical keyboards at home I bought a budget chinese one brand new and a decent one second hand for cheap.
No real difference between them. I believe the switches alone on the decent one are worth like £50+.
I'd say just buy a cheap mechanical no need to spend £150.
This xmas I got a razer chroma cyanosa keyboard for about £50 and as it is very quiet it must be a membrane. I love it, and it has a quality feel.