Susanoo Arrow
Chidori is imperfect without a Sharingan. Furthermore it can leave you wide open if it fails. If an opponent uses Wind in some defensive manner it's deflection is nearly assured.
The Arrow is simply a chakra manifestation meaning no element beats it specifically. Furthermore it seems to have a far greater speed as Danzo seemed to note. The arrow also has superior range that is both deadly, but also protects the user from counter attacks.
The only flaw is I seemingly smaller hit radius (arrorw tip vs the chidori Palm plus surrounding lightning), and the chakra drain if one is using a MS.
Which move is stronger? Which move can kill better and is more useful.