I think either would be fine, but it sounds like maybe you'd be better of with a Sonos.
It's half price, and offers multi-room later which it sounds like you may be interested in. The Pioneer looks nicer, and plays the high resolution files, but unless you're definitely into those, I'm not sure it's worth making a decision based on it.
I recently had Sonos doubts due to hi-res, but then wondered how many current CDs I'd actually replace with hi-res versions, and how much music I like would be available. It seems perhaps to be heading for a DVD-audio / SACD type niche.
I'm currently a bit fed up that the speakered Sonos Play 3 / 5 are similar price or cheaper than the Connect, which has to be hooked into an amp, but I've decided to stick with Sonos to extend into the living room and my surrond system. Nothing else really seems to fit in terms of the ease of use, (my existing Sonos after a few years has never failed, skipped, or anything), sound quality, wireless but doesn't use the normal wireless network bandwidth, multi-room integration, and no need to turn on a TV to use it. And when I did have a query the support was very good, (turned out it was the ripped file that was corrupt BTW).
Hope this helps, but as at the start, by the sound of it you won't go far wrong with the Pioneer, but I can vouch the Sonos will also be good.