Both headphones are in different markets. Arctis Pro is on that dreaded "gaming" market. Shade aside, I won't deny the quality and performance of some gaming focused products. However, the DT-1990 is a serious audio professionals tool. I traded my DT-1990 with an audio engineer for his T1, he almost drooled over the specs and performance of the DT-1990.
What I'm getting to is, you will find a VERY different sound signature in the DT-1990; focused on transparency, accuracy and reliability. The bass on the DT-1990 is extremely competent, but no where near bass cannons. The DT-1990 shines on the treble, which if you're not used to Trebledynamic house sound, you may find its insanely detailed sound, fatiguing, bothersome even. Another thing, DT-1990 impedence is 250 Ohms, Arctis Pro is only 32 Ohms. That means you will more likely than not, will need a decent headphone amplifier to go along with the DT-1990. I'm talking about amps with somewhere around 500-600mW at 300 Ohms to get the most out of your DT-1990. I'm sure an amplifier with the Arctics Pro is not needed
To answer your question, without having listened the Arctis Pro; which it's kind of hypocritical on my part, but having owned other gaming focused Headphones and used the DT-1990 extensively. I can say with at least...60%? certainty, the Arctis Pro stands no chance of being "better" than the DT-1990. The build on the DT-1990 is the best I've had so far, it made the T1 (Beyerdynamic's Flagship) look poorly constructed in comparison, being a pro tool is completely serviceable. I've had the DT-770 for 8 years now, I've replaced the plastic sliders and pads and the supplier has all the parts to practically replace the headphone in its entirety, that also applied to the DT-1990.
The gaming headsets I had fell apart in months, good luck repairing those. In fact the last fancy gaming headphone I had fell apart so badly, that I decided to opt out of anything gaming related to audio and stick to pro audio stuff. Haven't looked back since.