Could Levi Ackerman defeat Ariya Stark?

Spoiler alert!!! 

Well, this varies depending on if Levi is using ODM gear or not. If so, then Levi beats Arya EASILY because his speed and maneuverability would be impossible to overcome. If not, I think it would be a much closer fight, but Levi would still win.

To analyze this more closely,

• Levi:
• grew up in the slums, learning how to fight effectively and dirty from a very young age, being able to defeat grown men in his early teens. This makes him a highly skilled fighter even before he joins the Survey Corps and refines his skills more.

• Arya:
• A noble-born who always took any opportunity to learn how to fight with a weapon. But because of her status as a noblewoman, it was much more difficult for her to achieve this than Levi. And in her later years when Arya was on the run from Cersei and the Kingsguard following her father, Eddard Stark’s, death, she further refined her skills in the company of Sandor Clegane and Brienne of Tarth.

But at the end of the day, Levi was fighting for his life since the day he was born while Arya only had to pick up in her later years which gives Levi an advantage in terms of experience. I hope this passage was helpful!