Personally?

If I didn't have to have people hear me, the blues. Unfortunately, they're super-loud. I used silver switches for a while, and I think I might switch back. The current keyboard I have is a Logitech one that I thought was basically a brown analogue, but it's actually just a long-stroke silver equivalent. I was hoping for quiet with tactile feedback, and I got quiet with longer actuation distances. Not all too awful, but not what I really wanted.