White is blinding. I went with grey and never looked back. It just looks so much smoother IMO.

Having said that, I would rather have themed backgrounds. The 3DS had them, so what the hell Nintendo?

Uh, I haven't tried changing it to grey but seeing that pic I think I'd prefer it grey.

Shouldn't make a difference, it's a cheaper IPS display not an OLED display, basically the backlight is on regardless if it's light or dark theme.

Dark mode because I don’t want to wear sunglasses when I turn on my switch on the TV at night.

This made me laugh like a stoned hyena, thank you.

Actually for LCD displays dark/black draws more power than white (with the difference being miniscule, but still more)

Should be a negligible either way.
The bulk of a LCD displays power consumption is the backlight.

Here in USA we spell it gray. 😛

Mostly dark but sometimes, when I'm feeling REALLY frisky, I switch it up and go with light. So many choices!

I choose dark theme due to health problem of mine the white theme causes me intensively headache, so bottom line the dark theme is much comfortable for my eyes.