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Black. I had a white one and its padding got dirty too quickly - the originally grey rubbers turned yellow-ish. And, the clear plastic on the white collects dirt in the perimeter. Though, white DSi might end up being better since it's matte.
I made my own DSi... too bad it only works with a cookie...
Technically, my DS is gray-ish Black, gotta wash it sometime... it turns darker when I wash it... and my L button won't work anymore... replaced it with another cookie.
My DS is that silver-gray cover with patches of white on the edges where the paint's coming off. Oh, and scratches. Lots of scratches. Doesn't matter since the thing still works and is hard as a rock.
I have 3 DS Lite, a Black one, Cobalt Blue/Black one and the Dialga/Palkia one. I had a white DS Lite, but the hinge broke off and the top screen stopped working.