Yeah, it is not very straight forward. This is why it's easier to use MSRP to understand how the company views the hierarchy of their own product lineup. When using this approach, Hifiman apparently values the HE6se v2 above the Arya - regardless of what the actual street prices, and people's opinions/feelings, are.

Between the two, the HE6se is the more punchier and dynamic pair (arguably, even rivals the Susvara, in this regard), whereas the Arya has the more impressive headstage with a meatier low end rumble (at least the Stealth). You can always apply EQ to the HE6se to add more quantity to the sub bass region, but the comfort leaves a bit to be desired, which the Arya fairs much better being lighter while also having a subjectively better suspension headband design.

So it's a matter of what the balance of features you value more.