You forgot to mention Naughty Dog, who work in the UK, Put Uncharted 2 up there!!
I would say that UK games are really starting to get better than some Jap games now, so I giving my vote to the UK, before tho is the PS2 era it was Japan games easily tho;)
it's the future of handheld
PS VITA = LIFE
The official Vita thread http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1