Who sings better runs Christina Aguilera or Ariana Grande?

It is difficult to objectively determine who sings better runs, as it is a matter of personal preference. Both Christina Aguilera and Ariana Grande are highly talented singers known for their vocal prowess and impressive vocal runs. However, each singer has a distinct vocal style and approach to runs, and it ultimately depends on the listener's individual taste and preferences to determine who they believe sings better runs.