I personally prefer the black.
It helps hide the filter inlet and outlet, looks tidier and cleaner, the plants contrast beautifully against it. The wood looks great in both.
Nice tank by the way! I prefer your layout in the black pic, it looks more natural.
The black will make your fish pop, due to them being lit up by the lights against a dark background, it just makes them stand out so much more.
Also, I agree. I've done both, and white is too much for an area where you relax in dim light and watch TV or read. It's just too bright for me!
I look forward to seeing the fish! Keep us posted!