example: if you have move up relative to scene it will move up regardless of rotation. Move up relative to actor will use the top of the actor as the up direction, so if it gets rotated a little bit youll move at a angle because its calculating the up direction of the top of the actor. Which is what you would want in somethign like a topdown racing game where you rotate to steer but you always want it to move foward in regards to where the front of the car is.
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example: if you have move up relative to scene it will move up regardless of rotation. Move up relative to actor will use the top of the actor as the up direction, so if it gets rotated a little bit youll move at a angle because its calculating the up direction of the top of the actor. Which is what you would want in somethign like a topdown racing game where you rotate to steer but you always want it to move foward in regards to where the front of the car is.