Increased damage and reduced healing load are the obvious ones. eHP is always a minimum-value consideration. Returns diminish at a quickly-accelerating rate as you get above the minimum required level. Bringing 600 VIT to Sastasha wouldn't do any good when a SCH fairy out-heals every bit of damage the dungeon offers in the first place. For any content where the additional 25 VIT is not necessary, the increased damage, recovery, and parry offer superior advantages.