I have 2 that top everything else. 1) Party chat, lack of this on PS3 was my biggest grief on PS3 compared to X360. 2) Recording, seeing as I've played over 600 hours of BF3, I've had moments where I have wished I could've saved that sweet kill or odd happening so I could show it to my friends.
Honorable mention goes to DS4 considering DS3 was way inferior to X360 controller this gen. And it wasn't because of stick placement.
Edit: Fine, be boring and aswer "New games and more power". :p