Watch that anglophilia, son
I don't think it's that British people "have a better sense of melody" (that's a bizarre relief akin to believing black folks inherently have a better sense of rhythm)- I think it's more that the foundation of what became British pop music placed a greater emphasis on melody than the blues, which was the main foundation for what became American pop music.
I'd put Brian Wilson's pop songwriting abilities against any Brit's, The Beatles included. But I will admit that like you, I general prefer pop from the UK and the melodies are obviously a big reason. And though he's not pop *or* white, I'd put Duke Ellington's melodies against those of any white composer, regardless of era, genre or country of origin.