... Hell, I've bought over 800 bags at one time from BB Bastard...
*Mouth drops to the floor* You are in the retail buisness right?
I recommend getting both, White makes it very easy to sight in your gun/hopup and black is hard to trace. Just remember that because it's hard for them to see your bb, it's also hard for YOU to see it. So you need to weigh out how much stealth to the ease of you tracing your shots to find what you want.