i have tested loads of no-name cheap chinese dmx dimmers and never had any compatability issues at all
ive also used a few branded dmx dimmers both mains voltage and low voltage and again have had no problems
the only limit that i know of is that loxone only supports device upto 128, not 512, so as long as you address your devices in that range then they should work fine
also the loxone dmx detect function doesnt work with most 3rd party drivers (might work with rdm capable?) so you have to manually configure each devices device ID and add them manually into your config.
the better drivers have been the brand LTECH, which have good bottom end dimming, are cheap and are available in CV and CC and have models with inbuilt power suppies as well as the usual DC oneshttp://www.ltechonline.com/html/en/products/