Employment doesn't signify you are better than someone. Some employed people hold meaningless jobs or perform very poorly in their position. Some unemployed people are very dedicated and hard-working in some other cause, such as saving the earth from decepticons. The work you do is more meaningful than the title.

Bender has a comical tone to his voice which brings laughter and amusement to those around him. Optimus Prime has a disturbingly deep and raucous voice, and talks very slow, causing confusion and discomfort.

Optimus Prime has two useful forms: a semi-truck, which can haul all sorts of necessary goods, and an enormously strong humanoid, which helps fend off interplanetary attacks. Bender only has one form, and it isn't very helpful.