Thanks, @milneraj, that was incredibly accurate.
I’ve used most of the switches under discussion, and I would rank them almost the same.
In terms of Topre vs. Nopre, the feel and sound differences are exactly as you describe. I would say that my experience with Nopre [ABKO] is that it is a little louder than U4 or Silent Topre. I don’t consider Niz to be ‘silent.’ It sounds like boiling water when you type. Fortunately, it is not obnoxious.
I prefer lubed Silent Topre to stock Niz in terms of quietness and probably feel, but I prefer stock Niz to stock Topre in both. Niz really is almost linear [a consistently tactile linear on the downstroke] and less ‘in-your-face’ than stock unsilenced Topre. You’re right about the ‘wetness’ of Nopre too.
Ultimately, like you, I believe that MX-type mechanisms are superior for typing. I believe that they offer greater precision in terms of locating the tactile event while typing, so that you don’t have to bottom-out. When I typed a review of my ABKO keyboard, I typed the draft on the AKBO, but ultimately typed the final version on Kailh Pro Purples, because they were more precise.