There seem to be two questions:
1) What background color for schematic capture; and
2) What background color for schematic editor.
To me, "schematic capture" means I am working on the board and have tools like DRC. "Schematic edit" means I am working on the schematic and have tools alike ERC.
The poll only allows one choice. For schematic edit, my back ground is white or near white and the grid is usually off.
For working on the board, my basic colors are black background, red for top layer, blue for bottom layer, and a variety of other colors for airwires, SMD pads, TH pads, vias, and other layers. The grid can be a useful tool in that setting and is frequently switched between on and off. I find the high contrast of a black background is helpful. When I print, I usually reverse the background.