@zoomzoom:
Of course, that is my opinion, which is subjective to my point of view. But after I saw the X-Factor version of Hero (which my friends have agreed to be stunning), my opinion shifted completely in favor of the Brits. (Video in spoiler)
And I base Leona's success on her massive global status. I mean, she's the first reality TV show winner to be given a worldwide debut (which I'm sure Clarkson could have had, too), but to be so successful so fast is rare.
Plus, I think AI became infamous for the horrible auditions compared to the great ones. That's what really turned me away, when they showcased less talented people and more "entertaining" auditions. I'm pretty sure they strayed away from that recently, though.
-----
I have heard, and I'm sure for me it's the case, but "the grass is always greener".