Because I can carry literally thousands of mp3 and it takes seconds to access any track that I might want instead of searching through all the cds. The mixing process also is almost instant so I find I can keep tracks in the mix a lot longer and spend more time messing around with them. Cd decks are definately more fun and much more hands on I just find that traktor more suits my style and can see how cd's would be more suited to yours... just a guestimate from listening to your mix, I dont know the songs so just guessing and what your doing. That was a bit of a ramble, any of it make sense? Love the tunes btw