The message of 1-2 Samuel is NOT "be like David" and "don't be like Saul."
God is David's ultimate concern. 1-2 Samuel are about Israel's first kings, Saul and David. Ultimately, they look to the great King, God himself.
These are gospel-filled stories, unflinchingly honest about sin and society, but saturated with hope of salvation. The two key characters (apart from Samuel) are both royal sinners. But Saul and David are as different from one another as darkness is from light. For Saul, God does not appear to be a major concern, perhaps not a reality at all. For David, God is his ultimate concern, the ultimate reality, and carries ultimate weight. This is what it means to "honor" God. Therefore, "those who honor me I will honor, and those who despise me shall be lightly esteemed" (1 Sam 2:30). Saul is destined to fall and David to rise.