Mw3 zombies

Currently leveling guns in warzone for mw3 zombies. Any ideas on what guns will likely be the best for the new mode?

I am doing shotguns and have a few ar's lvled. In previous games there has always been a priority for dps and ammo capacity. Ar's are always reliable, but now there are battle rifles too, I dont understand the difference. Shotguns were really good in bo3 and coldwar.

Cold War made ammo capacity irrelevant (one could argue alt ammo types did that) but DMZ seems to not be like that, offering a limited amount of ammo.

I find it hard to think about this stuff while including pap mechanics in dmz... plus, how will health scale through the game; when will you actually NEED to pap?

Any foreshadowing thoughts on the mode, or what guns your hoping to use in the mode?