Some extensive writings are available on this subject. The real answer is, it depends. There are so many variables and much of it depends on chance.
Staying in place may very well be safer if you don’t leave early. Getting stuck on the highway is probably the worst option. Keep in mind that hoarders will likely be viewed with disdain. It could be your country sheriff, pastor, mayor who comes and “asks” for your hoard. They may be smiling but will be ready to use force.
I guess my point regarding leaving is...where would one go if you don’t have land you own somewhere else? Why would any other area welcome you? If SHTF everyone would be hoarding. If there’s enough government force active out there to confiscate, then one would also have to assume, things haven’t fallen apart completely.