Not sure what issue it is you are trying to have answered. All controllers you mention have good sound cards (if only because really bad sound cards just aren’t around anymore in brand controllers).
Don’t get dragged into the 16-bit vs 24-bit and 44.1KHz vs 96KHz hypes. While it doesn’t hurt to have higher values, it does not really offer anything in terms of better quality. The only exception here being if you have actual 24-bit/96KHz recordings (producers that make their own tracks might). EVERYTHING else has been bounced to 16-bit/44.1KHz (aka CD-quality) for the original WAV or CD version. So if you play a 16-bit/44.1 KHz track on a “higher” sound card, where does the extra quality come from that is not originally there?
The reason that studios and producers work with 24-bit/96KHz sound files while recording, mixing, editing is that the extra headroom and such is very welcome when you mix. But when they are done mastering, the track then gets “bounced” to 16-bit/44.1KHz for distribution.
Balanced XLR has a higher signal level than RCA line. Higher signal levels mean higher S/N ratios, which in turn means better sound. However, in our DJ environment of (often) mono PA’s in challenging acoustics environments, playing in high volume places with lots of people making a lot of noise of themselves and such, it is in my belief (and has been for a long time) a waste to worry about what comes out of your mixer/controller. As long as you use high quality tracks, lay low on the EQ other than for effect purposes and watch your gain levels, you will get the best out of the PA it has to offer.
If you are a mobile DJ, you are also responsible for the PA (usually), so getting a PA that sound good to YOUR ears is important. But you can’t change the acoustics of the rooms you are asked to play. If you know about acoustics and such, you can make sure you put your speakers where they do their best work, learn to put your subwoofer somewhere that it doesn’t go either boomy or suffers from interference (standing wave). Short of going in with a graphic EQ (31-band) and analyzer and spending an hour finetuning a room (and still only succeeding for one hotspot), there isn’t much you can do.
So, take care where you set up your speakers, use only high quality originals for your tracks. If you buy compressed at least try to ascertain that they are truly in the format you bought, but better yet, spend a bit more and buy the wav file and compress it yourself.
Obey the “rulez” of gain staging (0dB Rulez & Red is Bad) and you should be good to go.
Hope that helps some.
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