Depends which main(s) do you plan on playing later. Danzo is way better for lightning main, but his use is limited entirely to lightning and fire main (for cheaper teams fire often requires either sage jiraya or sage naruto as well). Naruto is way better choice for all other mains except lightning- those two have the least viable teams.

Both ninjas are awesome. Mathematically you have way lower chances of getting danzo (12.5%) from kage treasure, than getting naruto (33,3%) from sage treasure (50%, since you wrote you already pulled Ao).

If you don't have any barrier ninja for lightning or fire (darui, haku, mei, onoki), i'd suggest going for danzo. You can get sage fairly soon after, since like others mentioned, he's often in the events.