Popular colors for bathrooms make you think of a spa. So pale blues, aquas and greens are nice. Grays are also popular right now.
Blue or Aqua.
If you choose a neutral, white, tan, grey, you can change the colors of your accessories and decorations, throw rugs, towels etc. at anytime and will still go with the walls.
I think color is definitely subjective, but I tend to stay with neutrals. Good luck!
My opinion would be white, it can be dressed up with coloured accessories for a new look when you are looking for a change.
I like white because you could change curtains towels rug pictures to any color