my OC Maxion and Phil's which is himself as the chosen ones for Optimus Prime. However...there is a certain difference between the two. Both have Model OP but are separate versions of each other.
What makes these two different is that Maxion from Phil, he is self righteous and at some times naive. He would also doubt himself whether he is worthy of being Model OP's chosen host and a Prime plus sometimes quite reluctant to do extreme measures in times of hardship, although Maxion may have some self building....he has shown great leadership and protected those who he cares the most and those who cannot protect themselves.
in Phil's case, he's more veteran like and would sacrifice himself for others to live. Being the son of Ciel, it was his duty to protect everyone and while both he and Maxion have different reasons...their motives are the same. Phil trained Maxion to become a better Prime as the ever learning Maxion begin to understand his role and destiny in this world.
Phil's Model OP is based on G1 Optimus Prime, while Maxion's is more on the movie verse.