Im gonna be real with you here and dont get any of them. Keep saving for Angel God Konan/(if you can get his chakara round 2 or have a jinpachi) Edo Deidara /Minato/ or Kushina [Habanero].. these ninjas are good all round especially if you dont have much power

The reason you shouldn't go for Edo Hiruzen, is the same for reason everyone been telling you, if youre not a p2w or up there BP wise then he wont do you much good because odds are youll only be able to build a team around him and unless you wiping out your opponents rounds 1,your edo hiruzen will must def be dead by the time you c*e his mystery again.

As for Danzo, his kit is good/decent, the down side to him is that his mystery is 80 chakara cost which is the reason no one really uses him in CN.... its like trying to build a tendo team but with a tendo that can only target 1 person