I don't hear 'Wild Honey' or 'Original of the Species' as being particularly "pop". Also, is 'Sweetest Thing' (1998) hugely different from the original? I didn't really hear that big a difference...
Anyway, I'll plug for 'Sweetest Thing' and 'Stuck in a Moment You Can't Get Out Of' as the purest, best, "pop"-like songs.
'Window in the Skies' is quite good, but a bit too slick and with some regrettable lyrics (also some good ones, like "love has left a window in the skies" -- I dig the metaphor, but some of the rhymes in the outro are cringeworthy). "I'll Go Crazy blah, blah, blah" is the probably the single worst U2 song I've ever heard.