I own a MCX8000. Never had the screens freeze. IF the FX are what matters, definitely go with the pioneer. For the same money you get a 4 channels on the Denon, it has built in DVS support, has a rugged metal chassis vs the plastic of the pioneer, 8 performance pads/hot cues vs 4, and a second screen for less money. The Denon was also awarded the title of Ultimate DJ controller while the Pioneer only has a Innovative product award that I am aware of.
Also, Denon has clearly stated that the MCX8000 will get Engine Primer upgrade as it is their flagship controller.
Personally I find Pioneer to be very slow to innovate and overpriced where as Denon is pushing the market in new directions and giving a lot of value for the cost the consumer is paying. I use my MCX as my workhorse for gigs and often as a mixer for CDJ or turntable setups as carrying less gear is always a plus. I think the current Engine software and Rekordbox are both pretty lackluster. The primer version of Engine looks to be a major step up. I think your decision should come down to
FX- Pioneer clear winner as of now but updates could change that
Durability- Denon kills it in this category. All metal chassis vs plastic.
Value- Again, Denon is a clear winner with 4 channels, DVS ability (through Serato), and a second screen. Cheaper by average of 150 dollars and most places are also offering coffins for the same price as list.
Software – No clear winner here as of now. Though with Denon slated to release Primer gear soon I think the Denon will edge out the Pioneer in this category.
Support- Dont know Pioneers plans to update and add more features but I do know Denon is committed to keeping the MCX as the center piece of its controller line currently so will be adding features. I know Pioneer tends to not push out much new features and has stared a focus on PA gear so its a crap shoot on whether updating their controller line will be a priority.
