Personally, I prefer the buckling springs on the old IBM clicky keyboards.
Don't get me wrong, I think Cherry MX Blue switches are great, but I still think buckling springs are better.
The thing I don't like about Cherry tactile switches is that there is a noticeable "bump" on the release of a key.
This effect is nearly absent (in fact, it's slightly the opposite effect, it feels more like a springy pop) with buckling springs.
This is visible in the force diagrams.
|Cherry Switches. MX Blue (and Brown) switches have a noticeable drop in force on the return,
this results in a noticeable bump in the return of the keypress. It has
the opposite feeling of the Buckling Springs' return path.|
|Buckling Springs. Notice how the return path is almost completely smooth? It actually jumps up a little near the end of the return of the key press.|
As you can see from the two diagrams, the feel of the key return is completely opposite on the Cherry tactile switches versus the IBM buckling springs. The actuation is fairly similar though.
This is the main reason I don't like MX Browns, I'm not really a fan of the tactile feel of Cherry switches... I do like MX Blues, but mainly because I like the clicking (even if I can't hear it with headphones). It's been awhile since I've used Browns though, so, perhaps I wouldn't notice a huge difference between blues and browns if I can't hear the click. All I remember was that I originally thought Browns and Blues were the same, except for the noise, but I remember them feeling different when I tried them...
Also, the actuation force is too low on MX Blues for me... would love to see some keyboards with MX Greens (basically, MX Blue switches with MX Black springs), but they don't exist.
Either way, bucking springs are better.