The Dendro meta-definer vs. the niche out-of-world experiment
Pick Alhaitham if…
Pick Aloy if…
There is no competition: Alhaitham is one of the strongest characters in the game, while Aloy is a limited, unconstellated promotional unit with fundamental kit flaws. Use Alhaitham for everything; use Aloy only if you have no other options.
Alhaitham
Aloy
With Alhaitham
Although Alhaitham focuses on Dendro, Kazuha is vital for grouping enemies and shredding the RES of secondary elements like Electro or Hydro in his teams. This grouping ensures Alhaitham's mirror projections hit as many targets as possible for maximum efficiency.
With Aloy
Kazuha is essential for Aloy as he can group her Chillwater Bomblets together using his Skill, making it much easier to trigger all four stacks for her Rushing Ice state. He also provides the Cryo DMG bonus and RES shred necessary for her to deal relevant damage.
Weapon
Light of Foliar Incision
Artifacts
Gilded Dreams
Sands
Elemental Mastery
Goblet
Dendro DMG
Circlet
CRIT Rate / CRIT DMG
Substats
Energy Recharge > Elemental Mastery > CRIT Rate = CRIT DMG
Weapon
Thundering Pulse
Artifacts
Noblesse Oblige
Sands
ATK %
Goblet
Cryo DMG
Circlet
CRIT Rate / DMG
Substats
Energy Recharge until requirement > CRIT DMG = CRIT Rate > ATK %

