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.