Key Takeaways UnitedHealths diversification drives stability, but margins face strain from rising medical costs.Humana's benefit ratio improvement and CenterWell growth highlight stronger cost control.Humana trades at a discount to UnitedHealth, with higher earnings growth and rebound potential.In the ever-evolving health insurance landscape, UnitedHealth Group Incorporated (UNH) and Humana Inc. (HUM) stand as two dominant forces. Both companies have built resilient business models rooted in Medicare Advant ...