What BodyObject should I use?

I want make a ship that will move forward in the direction its facing. Do I use BodyVelocity, BodyForce or BodyThrust for this?

Whichever one you want. I like body velocity

part = script.Parent.Part
bv = script.Parent.BodyVelocity

dir= part.CFrame.lookVector

bv.velocity = dir

I like body velocity because it is very smooth and easy to manipulate if you know how to work Vector3 directions.