the truth is that most of the whales just like to stomp on low powers and kurama doesn't let them do it as easily as kakuzu eg, ay 4th full sb or edo hiruzen does.

naruto six paths is better for them because requires no brain to be used correctly, that's why they prefer to use him most of the times, because they can go on playing on auto and be sure to get what they want easily.

but on par power situations, overall when we talk about not non existant move 2-3-4 fights, then kurama is better than six paths naruto.

why?

1) his boost to combo rate is higher (+80%, vs +45%) and is easier, theoretically, to make it proc since it's you that select the target you want to chase (beware, i'm talking about situations where you fight move 2-3-4 that have comparable combo rate to your move 1!)

2) his standard attack delivers ignition. This may feel like *eless feat, but on specific situations this is quite annoying.

3) his mystery triggers immediately any 20/30 combo chase also against super armor ninjas (like, for example, edo hashirama or madara 10 tails ones...), thing that naruto six paths doesn't do at all, overall when the enemy runs at least 1 dodging ninja.

4) his mystery damage is higher, overall with bond mystery.