Watching the preview today there were a few things that stuck out, that in my mind cement why I prefer Arylie over Adilie.
1. Language
It took 350+ episodes for her to be able to call Aditya an idiot and only about 50 for her to call Aryan a donkey. She also uses "tum" and more casual and equal language with Aryan (which is weird because she uses "aap" for Arpita, Nishant, Roopi, etc. who are similar in age to him so what makes Aryan so special that she is informal with him?) than she does with Aditya, who is always "aap" or "babu saheb". I mean she never called Aditya by his first name during their most intimate scenes but I feel like once the Arylie story really gets started we might get her actually called him by his first name.
2. Behaviour and relationship dynamics
Imlie is able to go toe-to-toe with Aryan when she is fighting with him and/or has a different viewpoint. After the forced marriage and the move into the Tripathi's house as a maid, she was so scared of Aditya that she put up with his shitty behaviour and was never able to demand any respect from him. She has no issue with speaking up and holding her own when it comes to Aryan though. I recognize the dynamic is different between a forced marriage vs. boss/employee relationship but it's still a notable difference. Imlie was weirdly deferential to Aditya even when she disagreed with him and that meant that she was never able to truly be on equal footing with him. I didn't like that dynamic because it didn't strike me as very healthy in the long run for a husband and wife.
3. Chemistry
Finally, in the promo and in the other scenes we've seen of them so far Arylie have undeniable chemistry even when they're arguing that allows you to actually envision them being together as husband and wife. Adilie had chemistry too but in an old-school way that still sometimes felt too platonic/unromantic because of the mismatched dynamics. Beyond that weird shoulder kiss scene, I could never really wrap my head around them being together in a more romantic/sexual way that is more fitting for a married couple. I can very easily picture Aryan and Imlie in that way though and it seems like we might get a peek of that with the upcoming Shiddat dance sequence.
Would love to hear others' thoughts on the differences between the two couples as well!