Top left (especially), or bottom left I think… Top left is elegant, has a variety of hues and not just plain blue, modern… I think it would suit a wide range of consumers ¯_(ツ)_/¯
I like top left the best, but honestly almost all wallpapers are too bright for me. I want something really dark. I dislike feeling blinded at night when I close all my software
For the last wallpaper (the mountain one) there was a light and a dark version. I hope they do something similar here (I’d like it to integrate with Night Colour).
Top left looks best as a default wallpaper in my opinion. Nice mix of colours, not too bright or too dark, and generally seems appealing while not being too distracting.
Bottom right looks awesome, but mid right has potential too. The only thing holding it back imo is the overall grayness of the foreground being a bit too much.