Revelation 6:2 (KJV)- And I saw, and behold a white horse: and he that sat on him had a bow; and a crown was given unto him: and he went forth conquering, and to conquer.
Looking at the context it is certain that all 4 horsemen are sent out for a purpose of destruction, and none of them represent Christ the Messiah, and none of them is bound to make any judgnemnt whatsoever, they are just following orders.
But in revelation 19: 11 (KJV) - And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.
Here it is plain who is being reffered to, and not only does he make war but judges too which coincides with the text in John 5:22 (KJV) - For the Father judgeth no man, but hath committed all judgment unto the Son:
Revelation 19:12,13 (KJV) - His eyes were as a flame of fire, and on his head were many crowns; and he had a name written, that no man knew, but he himself. 13 And he was clothed with a vesture dipped in blood: and his name is called The Word of God.
We already know that Christ is the Word of God which materealized in flesh( John 1: 1).