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I use the mixtrack pro 2.
I’d say it’s a good price, although I’ve only been DJing for a few months (and quite sparingly at that, on account of junior year of university being quite a nuisance).
For beginning I think the mixtrack is great given the two deck setup. I’d say by the time I’m ready to go four decks at a time I’ll be looking for some more substantial hardware. It’s a solid improvement over the first model and it gets the job done. A couple of the sliders leave a bit to be desired but overall the button and knob stability is pretty satisfying for me.
If I were you I’d see if somebody I know or a store nearby has one to try it hands on first.
As for the Pioneer, I have no clue. Maybe somebody else can chime in