Now there was a man of Benjamin, whose name was Kish, the son of Abiel, the son of Zeror, the son of Becorath, the son of Aphiah, the son of a Benjamite, a mighty man of valor.
Three valid reasons why the heavenly choice fell upon Saul are discernible, as pointed out by Philbeck.[1] (1) Saul came from a very wealthy and powerful family; (2) the tribe of Benjamin was centrally located between the rival tribes of Judah and Benjamin and thus strategically located to achieve the unity of the northern and southern tribes.  (3) Furthermore, Saul certainly looked like a king.  His being head and shoulders taller than the rest of the people is mentioned again in  1 Samuel 10:23.