My first thought is that 4-4-2 offers greater flexibility, it's more accessable. Still, in the end they're just numbers and not reflective of the play that takes place in all those dimensions. If executed properly, positive attacking displays are possible with a formation considered to be 4-5-1.
Not sure this warrants a new thread, though. I think it would be acceptable to fit into that which concerns the construction of our squad this coming season.
It's always 4-4-2 now apart from the most difficult matches against the other top sides and when we have no choice because all our strikers except for Adebayor are injured, which unfortunately is quite often.