Does Delta or Southwest have a bigger carry-on size limit?

Southwest size: 24×16×10 in — larger than Delta's 22×14×9 in
Both free: Carry-on included on all fares (including Delta Basic Economy)
Southwest advantage: 2 free checked bags — Delta charges $35/$45
Delta advantage: Assigned seats, seat-back screens, international network

Question

Accepted Answer

Southwest allows a larger carry-on: 24×16×10 inches versus Delta's 22×14×9 inches. Both airlines include carry-ons for free on all fares including Basic Economy. Southwest also includes two free checked bags on all fares, while Delta charges $35 for the first checked bag. For pure baggage generosity, Southwest wins.

Delta vs Southwest Carry-On Size