I agree with above comments, very different sounding. I recently listened to DarTZeel LHC-208 MKII and Aries Cerat Protos at my local dealer, coming from an all tube system of Allnic and LampizatOr I felt the DarTZeel wasn't for me while I instantly fell in love with the Protos. I now have the DarTZeel on loan while waiting for my Protos, and it's not bad at all, but it takes some getting used to from where I'm coming. Ironically though I sold my Lampi the other day to a DarTZeel NHB-108 owner, I listened to his system and it sounded wonderful!
I'd say you would probably not go wrong with any of them, both great products, listening in advance if possible is always preferred of course.
ChatGPT yields this comparison which might not be too far from the truth:
Sound Characteristics: Dartzeel is known for its transparent, detailed sound with a natural tonal balance. It focuses on musicality and clarity. On the other hand, Aries Cerat Protos is often characterized by a more dynamic and robust sound with a rich, full-bodied presentation. The choice here depends on whether you prefer a more analytical and transparent sound (Dartzeel) or a warmer, more dynamic sound (Aries Cerat).
I think you have to ask yourself what kind of presentation you like, and try to be as honest as possible with yourself. For example I can feel that sometimes in writing an "analytical and transparent" description can have a sort of negative vibe to it while "warm and dynamic" sounds like something we all would want, still I know plenty of people who buys into the more natural, analytical and transparent sound as it feels more correct to them. There's nothing wrong with either.