I'm a bit skeptical about two companies selling the same panel, one with 1000:1 contrast ratio and one with 3000:1. If it's just some image processing trick (making black look darker by making everything else on screen brighter), then it's not a real 3000:1 at all, it's just a marketting trick. If it's done by adjusting the backlight on the fly, I suppose you could claim that's nearly a real 3000:1, but it still isn't really. That would at least be worth having though.
I wonder if you set both screens to complete black, whether there's any difference at all.