Family Matters precon

So I read at several sites that Family Matters is the strongest out of the box or something and that Animated army is the weakest. On several YouTube channels I see that Animated army is holding out longer than Family Matters though so I'm wondering what makes the family matters one stronger than animated army? I'm planning on buying one of those 2 so I'd like to know what you think as more experienced players. I've only been playing magic for a month now so I'm not sure what to buy