Ashura ofcourse is that even a question?
I think he is more like Indra, cus he has a doujutsu and he doesn't seem to need help from others in order to be strong.
Wtf? He tnj sumire kagura and ao. How is he an indra?
I want to say both, but look at Hashirama for ****'s sake. The guy's OP and talented by default, but that never excluded him from being an Ashura transmigrant. He's more like Ashura imo, none of Indra's reincarnates would have spared Ao, and Boruto has that shounen power of making buddies with everyone.