in terms of everything..
1. batery life, size and weight.
2. high quality graphics game and apps (horn, the dark knight rises, infinity blade, asphalt 7, sky gamblers,etc)
3. better functionality in education, for teacher and students, can you name other device which can do better ?
4. the best tool for the disabled, the blind, cognitive disorders patients, etc
5. seamless, most responsive and most flawless controls.
6. can function as a phone and able to do most communication methods, text, video call, etc
7. best for navigation
8. productivity values is incredibly amazing.
9. one of the most efficient tools to make you laugh, mad, cry
10. can remotely control most other tools, like pc, game console, air conditioner, rc helicopter, home appliances, etc
11.pixel density is the best.
12. even can run windows natively, in near future, it will run windows 7 faster as x86 on arm virtualisation finished its development.
name a device wich can do better..., i will tell you what it cant do, and while at the same time, ipad can do much more.
this is one of the greatest invention not only in a century, but also all time.