You can't do (or it is much more involved) to do cuts with rotary knobs. So they serve only the DJ who does slow mixes, while with faders you can do both.
Pioneer DJMs have dozens of FX combinations to aid with fast/fancy transitions, whereas techno/trance (and similar) genres that rely on long smooth blends like the extra EQ channel and filters.
I don't know any hip-hop DJs that use Xones?
The Xones are also analogue vs digital Pioneer mixers which also plays a part in audio quality, especially if the source is analogue (vinyl, rack modules, etc).
I'm happy with my Pioneer DJM-750mk2... but also happy to exchange a kidney for Xone:96 :-)
Two CDJs cost less than weekend’s worth of personnel for a small club even.
If you’re a DJ that’s just starting out, it suck’s a little though. Usually you’ll start out on Native Instruments’ Traktor S2/S4 or Pioneer’s cheaper DDJ, and for your first club set you arrive early so you can familiarize yourself with the quirks of the CDJs. Or find a buddy with a CDJ home setup that you can practice on.
Today you also have influencers which are DJ-ing, but they don't have the skills, so either they have a pre-recorded mix or just use the CDJ auto-mixing features. Having a standard device they know how to operate is again critical.