Getting sage naruto is never a bad move. He's very flexible and can fit be used with every main. He's also strong ninja and will be used for a long time. You can get iruka for free from fragments refine like others mentioned, and asuma wb is such a situational ninja, mostly used for blitz teams or 9tails. Ideally you'd never want to use scrolls on sage treasure, which apart from events is the only source of getting sage.

tl;dr go for sage naruto