Guys, I'm fairly torn.

For Ux I've swapped his Dragonborn aspect from "heart" (gives a breath weapon) to "wings" (gives flight). But in the end it's only 30ft (average) flight. I want to enhance that by blowing a feat. But I'm hesitating between Improved Flight, for having 30ft (good), or Air Heritage, for having 60ft (average).

What do you think is more useful?