My favorite keyboards to date :
-The one on my Newbury Data NDR 9500 terminal (circa 1983). It has black Cherry sliders (=linear). It is very silent and smooth, and I can almost just let my fingers
touch the keytops to type. Very nice. And its unusual layout (well, different from a post-1985 microcomputer, that is, but almost the same as a Televideo 925/950/...) puts the Escape key nearer from the rest of the keyboard, which is a treat for a VI user. You can see it
here (don't worry, it was cleaned the following day!)
-A rubber-dome Hewlett-Packard keyboard which has caps, num and scroll lock LEDs on the related keys (circa 1995). Yes, it's a cheap rubber dome model, it's not even closed with screws but with cheap plastic clips (a nightmare to open) but I love it. Totally unlike the Newbury Data, the contact is made at the very end of the travel. What makes it special is that it's very precise : at the exact end of the dome "click", the contact is made, and you can't press the key a single millimeter further by pushing harder (which you can with every other rubber dome keyboard I've used), it's really blocked ; I really like that "hard stop". The cable is on the right side of the keyboard instead of the rear, which I found more practical in many situations. The key rows are very staggered, which I am not sure whether I like better or not.
-A NMB clicky keyboard (ca 1995). The clicking is not made by the contact mecanism itself but by a kind of plastic pin sliding in a zig-zag rail. The consequence is that by pushing really slowly a key, you can type a key
without (=before) making it click. Still, it's usually not a big deal and it's a very nice keyboard for who likes to literally "strike" keys, typewriter-style...
-The Amiga 500 keyboard. Nice linear action. I also like the distinctive, bowl-like shape of the F and J keys. The 600 and 1200 do not feel as good.
I like when key action is light. Keyboards with keys I really find too stiff include the Apple //e keyboard and a mid-nineties clicky Dell...
I'd really like to try a classic IBM though!