Pretty straight forward question. I'm just curious because I post both types and am a little surprised at what gets a good download count sometimes. So, you like it simple or complex? Stuff that keeps changing, grabbing your attention to brain stimulate? Or stuff that's more homogeneous, mellowing you to sleep?
example simple: https://www.newgrounds.com/audio/listen/803874
example complex: https://www.newgrounds.com/audio/listen/757441
Belyaevs-Fox
I like having a nice middle ground, where there is just enough going on in the background to keep me awake while letting me focus my attention on other things.