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You don’t experience black in absolute darkness, more of a very dark static-like fizzling grey. In order to experience the deepest black, you need to contrast it with something lighter.

I guess the main difference would be your ability to see your own body, and the light source.

Darkness is probably more disorienting, but also more familiar.

OK, wise guy.

There's a single bare lightbulb suspended out of reach in the void. The walls feel like ScotchBrite though you can't see them. You aren't wearing any clothes. The room begins to rotate slowly as if it were a large tumble drier, rolling you off your feet. The walls gradually turn red.

Peaceful or nightmarish?

The difference is that you could have a light on in the uberblack room and you wouldn't see the walls.