If you're going with USB sticks then the XDJ set-up will be a more club style feel, but having the power of the laptop with the RZ will be amazing as well. One is 1 piece and the other is modular so it might be a bit more options of adding another playing or taking one away.
Both are AWESOME options, but it's always about feel and use and sense of what you're doing as a DJ. I switched to controllers about 6 years ago and love the experience and feel, and as a mobile DJ with mostly weddings, the search function or software is what makes me the happiest! Good luck, but remember you win both ways....