@uninen - Late to the party on this reply for sure, so disregard if you’ve already made a switch.
I find myself in a similar situation looking to switch my home studio and broadcast point to either PioneerDJ or DenonDJ as far as overall ecosystem. While they offer similar basic requirements (master eq’s, good mic preamps, solid phono preamps, etc) one is the “club standard” (at least in North America & UK) and the other is a bit new to the scene and won’t be as deployed in the wild.
I have played on PioneerDJ equipment quite thoroughly (CDJ’s, XDJ, DDJ, etc) and recently spent a couple hours on a Prime4 - honestly it was very refreshing, particularly the FX and the logic with which you apply them. Took a few minutes to adjust, but then the creativity went into overdrive.
I spent the next few minutes on it adjusting the screen how I wanted with a few glances at vertical VS horizontal waveforms and honestly couldn’t decide. It’s nice to have both (CDJ style or Serato style) for whichever you are coming from.
Not sure about yourself, but in my case I need to consider guest DJ’s being featured on my radio show and playing their set on the equipment as well and what their comfort level will be with any given platform. Another consideration of course is the software…
Engine Prime does not have a large development team behind it, which is the biggest issue. They do have quite a backlog but are earnestly chewing away at it. I don’t really think a milestone release is far off now in mid Feb 2020. Rekordbox however does have a bit of 3rd party integration capabilities via a moderately exposed API that can be utilized for front of house and back of house operations quite extensively.
I know that Armin does this for his ASOT festival productions as well as in his broadcast studio so quite useful. I hope that something like this is presented by Denon for Engine, but with the basic features they still need to polish and QA, I don’t see an API layer being documented and released anytime soon.
Hope this is helpful for anyone else as well who may be considering the two! The pro’s and con’s of the actual devices have been mercilessly documented on YouTube already 