Just like 70% of everyone here, Zapdos is my favourite out of the three birds. Competitive-wise it's the best choice out of the 3 since Moltres and Articuno have a x4 weakness to rock and they have other weaknesses too. Zapdos' only weaknesses are ice- and rock-type moves but the damage is x2. Personally, I like Zapdos' looks and the fact that he's an Electric-type which happens to be my favourite type. Moltres looks like a naked Phoenix, but Articuno is the most beautiful out of the three. Anyway, Zapdos is what my vote goes for.