I've held off replying to this for various reasons but the reading has been very thought provoking. This thread should into the MO Hall of Fame.
If I had many weapons at my disposal, and if I had my choice of those weapons, I would pick a 9mm and an AR platform. If I had any other scoped weapons, the scopes would make the trip as well (optics can get banged up). The rest would be buried in the event I can make it back home at some point. I will cheat a bit and also take one of my hunting bows and all the arrows/broadheads I can carry (it's not a firearm...
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9mm ammo is generally plentiful and easily packed. The AR is versatile and in the .223/5.56 version generally readily available. If the SHTF I would imagine that there very well may be a few found lying around...not everyone can win. With the AR most parts are interchangeable (if the same caliber)...magazines can be plentiful, too.
The biggest problem with the 9mm (or any handgun) is magazines. Every model uses a different type. They are not interchangeable. If you lose them, you can't just pick one up off the ground. So magazine management becomes as important as ammo management. This isn't going to be like the movies where magazines pop up out of thin air and there is an endless supply in a firefight (just like those unlimited transmission gears in car chase scenes...LOL). Lose all of them and you have a short handled club good for breaking open coconuts.
One of the biggest problems I foresee is not the zombies from the city but trying to get to your designated area and not getting shot by those doing the same thing. Everyone will be in survival mode and it will be shoot or be shot. Chaos will reign supreme at first and unless you have a crystal ball you may find yourself far from your home, cut off from the very things being discussed here. One of the things I think about is getting out of the city if I'm at work even if it is not a full blown SHTF scenario. 18 miles through mostly "enemy" turf is going to be tough navigate.
Got a little off track, I guess. Brain is working faster than I can type this morning...must be the coffee