Comparing iPad A16, iPad Air 5, and iPad Pro M2

"Better" is subjective - and will be determined by which model best meets your needs. The model that you list are from three entirely different iPad families and ages.

You can directly compare the three models that you explicitly mention (or other models) here:

https://www.apple.com/ipad/compare/?modelList=ipad-11th-a16,ipad-air-5th-gen,ipad-pro-12-9-6th-gen

You can check the link below for a comparison. That page also offers a link to Chat with a Specialist.

https://www.apple.com/ipad/compare/?modelList=ipad-pro-12-9-6th-gen,ipad-air-5th-gen,ipad-11th-a16