What are you looking to use them for, serious scratch DJ-ing or just blending one tune into the next? Pioneer products tend to have more features and effects but cost a lot more than Denon, both make good sounding and reliable products IME. My friend uses two CDJ 2000s with Rekordbox and a DJM 800 mixer. I have a Denon MC6000 and a MacBook Pro running Virtual DJ which I use to similar effect. My setup was much cheaper and is more portable, quicker to set up. Where the pioneer setup wins is that it plays CDs and mine doesn’t, the music needs to be in your VDJ database so visiting DJs with CDs would come unstuck with a laptop/controller.