Both you guys have a point but Benjermingaye's point is stronger, slightly.
It's true that Sasukes Susanoo Arrow was redirected by a tree but let's stop playing that wasn't merely a tree it was Mokuton. We know Mokuton is tough, so a lot of the arrows power and force was probably stopped by the tree.
Orochimarus Kusanagi feat is still better because even though the trees in that forest aren't as strong as Mokuton, it was still a whole forest it plowed through and beyond plus the crater it left KN4 in was bigger than the one the Susanoo Arrows left, and Naruto didn't get scratched.
So Ben has a point when he says there's nothing to suggest Susanoo Arrow would hurt KN4 from a V3 Susanoo. However this is MS Sasuke in this thread at peak so I'm assuming he's allowed V4 so logically the arrows should get stronger but at the same time, this is KN6 now, who is more durable than KN4.
Now all one needs to do is decide if Sasukes arrow gained enough power (v4) to pierce through a cloak that's gained more durability (KN6) and based on all this, most likely not.