There is no universally preferred format. Many job seekers spend days perfecting their resumes, agonizing over whether to use a chronological format or a functional one. This question may be akin to figuring how many angels will fit on the head of a pin. There is no one perfect resume to suit every employer's needs. But there is a perfect resume for a specific opportunity. If you are going to focus on perfection, do it on an individual, rather than a global basis.

Most new jobs won't come from our biggest employers. They will come from our smallest. We've got to do everything we can to make entrepreneurial dreams a reality.
Ross Perot

Beware of all enterprises that require new clothes.
Henry David Thoreau