It's difficult to compare economy class seats as they are very similar. But there are a few differences out there, particularly in seat pitch.
Complaints about the tightness of airline seats are becoming more and more common. With the rise of low-cost airlines prioritizing quantity over quality, carriers worldwide are searching for ways to become more competitive. In turn, full-service airlines have found themselves reducing seat pitch in order to cram more people in their planes and ensure they remain competitive, faced with the likes of Ryanair, Wizz Air, and easyJet, among others.