Defensive Aspects
Aspect of the Protector:

Effect: Every time you hit an elite enemy, you gain a Barrier that absorbs a portion of incoming damage.
Best for: All classes, but especially for Diablo 4 Items melee-focused builds that need damage mitigation in close combat.
Aspect of Might:

Effect: Basic skills grant up to 25% damage reduction for a few seconds.
Best for: Builds where basic skills are regularly used, such as Frenzy Barbarian or Rogue builds.
Aspect of Disobedience:

Effect: Gain stacking armor when dealing damage, providing up to 50% extra armor.
Best for: Any build, especially when farming tougher dungeons in cheap Diablo IV Items World Tier 3 and 4.