I don't believe I actually had the Aries and Morpheus in my system at the same time. They may have both been in the house briefly, while one was waiting to be shipped out, and the other had just arrived and wasn't yet unpacked. But I could be wrong - a LOT of gear comes through here, and I only really report on the stuff I like.
In any case, I'd say they would work very well together just based on their individual excellence. You've got a DAC with beautiful tonality, that doesn't sacrifice resolution and in fact has some of the cleanest, most defined treble out there. Combine that with the sonic-scalpel that is the Aries, and you've got a winning combo for most situations.
I say most because if you want a euphonic, colored sound to fix flaws in your music/headphones, the Aries/Morpheus won't do that at all.