I like Sunny, since it gives me plenty of light to see my builds and things.
Trouble is, I have a really horrible computer monitor and it is completely forgeted up in terms of brightness/contrast.
If anything is dark at all, it appears pretty much pitch black on my screen, regardless of any changes to brightness/contrast on the monitor.
The only time I can ever see is if the game I'm playing has it's own in-game gamma slider, like Minecraft does (otherwise I'm blind at night).
Blockland doesn't have this, so if I encounter a dark environment, I'm generally completely blind.
Can be a proper nuisance even on a sunny environment, because shadows can make it awkwardly dark for me. (If you ever come on my server while I'm building, I'm often flipping the sun to the otherside of the sky to get a better look at a side of a build).