If you can paint the windowsm on the inside of the house, I would suggest white........It goes with everything on an interior. The only other option that I would consider on the inside would be natural wood finish, but I doubt if this is an option.

If you use trim then they should be the same white paint color as the window.

Not knowing the look and style of the interior of the house, I am giving you my opinion based on what I consider a good solution for most homes. Of course there are always other approaches..............

I very seldom see a great custom look with black interior painted windows unless they are an industrial style steel window........If this is the case, then you would not use wood trip around the window.

Black trim on Windows and Door Frames and really in style right now and modern. Look for examples on black trim windows in the search bar. I also just went through this whole ordeal trying to decide on painting window casings and trim.