For my project. Help me guys!

Which one is the best? 

Easy (Sincere Version)

http://www.youtube.com/watch?v=7GAXCQmwJ3M

Oasis (Piano Version)

http://www.youtube.com/watch?v=wHEwGhKjY_Q

How To Love (Piano Version)

http://www.youtube.com/watch?v=m21Vr_G2dzc

I'm Sorry (Piano Version)

http://www.youtube.com/watch?v=t8UyJYWl3v4

It's for my project in school. I don't know which one is better. Help?