To be truthful it really depends on the warnings I get and the location I am in at the time. Also depends on the type of zombie, Fast or shambler?
Overall I would probably choose my school as there is an entire underground complex that has hundreds of desks in it, as well as timber and a reasonable supply of heat and electricity with the solar generator complex. There is also a greenhouse area that could have food grown on it.
Altogether the underground complex sounds very useful, did I mention the doors to the underground are made of metal?