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.

My son is now an "entrepreneur." That's what you're called when you don't have a job.
Ted Turner

No one can help you in holding a good job except Old Man You.
Edgar Watson Howe