From my experience, the sound and loudness of a keyboard is least influenced by the switch.
The biggest factor is the case. I cut up a mousepad and put that behind the PCB of my Blackwiddow v2. this Dampened the sound considerably. For bottoming out, O-Rings might be an option. Also, cheap thin caps tend to produce louder noise (and higher pitched, which always seems louder).
If you want a mechanical keyboard, build quality and caps are important. But even more so, is typing technique. I bottom out too, but avoiding this is where most of the benefit will be. A friend got silent Reds. Those are among the most quiet switches i’ve heard. They are still mechanical switches that, depending on the board, will produce significant noise on bottoming out.
So, if it’s for typing and Office work, i’d recommend the Logitech K800. It’s not mechanical. I use that at work now over my MX-Board. It’s really tactile, feels consistent and is dead silent. For writing and Office work i prefer it over any mechanical board.
For gaming, i’d look into the ducky boards, maybe a leopold or a pok3r. All of those are well build and available with most cherry(clone) switches. Choose your size and switch and you’re done.
Also, Matias makes Alps style switches. Their quiet-click variant is actually really quiet. It’s much, much more tactile than you might be acustomed to from cherry style switches. They where to tactile for me, but if you can handle that, they are an excellent option. Boards are rarer though. Not sure what’s available to you.
Finally, if you want membrane quiet with a more “mechanical” travel and caps, a Topre board might be for you. The HHKB for example. They are expensive, but those that tried them find it hard to go back. And if mechanical feel plus quiet is your requirement, Topre is hard to beat.
Yes, i’ve got the G910 Orion Spark (now owned by the wife). Decent board. The Romer G’s take more force than Cherry Red or Blue. Mine felt a little scratchy. They are quieter than most cherrys. But still mechanical. So bottoming out will still Produce some noise. Especially since the G910 isn’t the best build board there is. Not sure on the other Romer Boards though.
If gaming + just quieter than cherry blues is the requirement, i can recommend them. If typing or dead silent is needed, i’d maybe look elsewhere.