I just think that staying in your individual comfort zone is advantageous off the bat. You don’t have the psychology of being in an unfamiliar place with unfamiliar faces around.
I know a lot of people think about heading south from northern states but the cold has plenty of advantages too. Number 1 is the fact that the urban rats will be the primary group heading south.
IMHO it depends on what happens. A complete collapse will mean very few people are moving. Once the highways are blocked in Florida people won’t be moving far or fast through Florida, too much swamp.