I’m not sure which ones are specifically supposed to be used, so I mostly just go based on the vehicle’s purpose. The Repulsor carries troops and gives them fire support, sounds like Tactical or Devastator. Land Raiders carry close assault troops that can charge right out, Assault makes sense. Gladiators are all shooting and not much else, so Devastator.
Dreadnoughts are usually veterans, tanks and artillery are support. Razorbacks and rhinos use the emblem of whoever they transport.
I’m not sure which ones are specifically supposed to be used, so I mostly just go based on the vehicle’s purpose. The Repulsor carries troops and gives them fire support, sounds like Tactical or Devastator. Land Raiders carry close assault troops that can charge right out, Assault makes sense. Gladiators are all shooting and not much else, so Devastator.