Are Rigidbodies more tasking on the server compared to transform based movement?

I am trying to make a flying game that will have 30 players in a match. Would using transform based movement for the plane be a lot less tasking on the server, compared to using a rigidbody?

 

30 rigidbodies amount to computationally next to nothing even for a low end machine.

 

If you don't need dynamic bodies for realistic physics based collisions don't use them. Move your planes using a KCC (Kinematic Character Controller) and just store and calculate velocity of your plane manually. Dynamic bodies in multiplayer are rarely used due to all the complications they come with.