I switch between boards depending on what I'm doing, or just whenever I get the urge.. alot of times I swap depending on how much desk space I need. If I'm working on something on my desk that needs alot of space, for example, I usually use my JD40 as it's easily moved out of the way where I can still type on it.
I usually like to game with my JD40, Model M for general typing, and a TKL or 60% for all around use. I do everything with all of my boards though.
So far my favourite board is the JD40, and it's been my daily driver lately.