That's a good question!
In the distant past I had an NEC clicky keyboard with NEC blue oval switches. I loved that keyboard. But in my blissful ignorance I threw it away and endured many years of rubber dome keyboards.
When I found out about "modern" mechanical keyboards I joined GH to discover the closest keyboard to my beloved old NEC, and settled on MX blues. My first two mechanical keyboards had MX blues.
But I started to feel they were a bit light, so my third keyboard had MX blacks.
I think I got MX reds next, to see how they felt. Great to start with, but over time (not much time) I began to feel they were too light. I still do.
Somewhere along the line I acquired another keyboard with MX blues, and then MX greens. I liked MX greens. Stiff like blacks, clicky like my old NEC keyboard.
At one stage I got an HHKB. I am using it now. It is my default go-to keyboard when I swap out one of the others.
During all this I have accumulated five buckling spring keyboards, all Model M. I love those, and I think that Model M is my favourite clicky switched keyboard now, and HHKB is probably my favourite non-clicky switched keyboard.
Do I go back to my old keyboards? Yes! The KeyCool with MX reds is on my gaming PC at the moment, but that's 'cause my daughter was the last one to use it when we were playing Minecraft, although she tolerates my heavier and louder keyboards, she prefers something a bit softer and, above all, quieter.
I use MX clears at work, which was my second most recently acquired switch, and alternate between most of the others at home, with a preference for Topre during the week, and BS at weekends.
I also have another lovely NEC keyboard with one switch missing, and a couple of spare switches to solder in as a replacement. All I need to do is find where I've put the old broken switch, as the old keycap lies with it.