I love both bands to death, and despite U2 being my all time favorite, Coldplay is quickly becoming a very close Number 2.
The day that U2 runs its course, I can't imagine a worthier successor than Coldplay.
It boggles my mind that Brian Eno could go from producing Viva La Vida (my second favorite album after Achtung Baby) to the relative disappointment that was U2's NLOTH.