I think the poll says it all... 75% for djm
Djm-800 also has full digital in/out, midi, and is the new clubstandard
So everywhere you go you'll feel right at home....
The korg has an effect unit per channel, an master effect unit, a loop sampler, intergrated firewire soundcard (Traktor Scratch certified), digital output, better midi support than the DJM800, customizeble EQ, custamizeble line fader curves etcetera.... The korg is so much more than just an ordanairy effect mixer.
But if i had to make the choice.. i'll take the DJM-800 because the Korg is an mixer for geeks and people who can think while they spin some tracks