Silly questions there about the weapons as long as it shoots bullets, cuts heads off and or incinerates the enemy there is no "best weapon" set up for zombies or any other situation. Sure you don't want to have a shotgun for long range but you don't want a missile launcher for point blank either! Also a shopping mall over here is likely to contain a grocery store or even two so theres lots of places to go get food, hide and also gather other essential supplies for your escape to freedom attempt. Not to mention the fact that there will be fewer people in malls if theres any advance warning as most malls are going to be closed.

Oh and in the end, the simple fact is we'd probably all die therefore Psy, you get the zombie girls, I'll get the camcorder and lets go down in history for making the first REAL zombie porn!