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.

We're supposed to be perfect our first day on the job and then show constant improvement.
Ed Vargo major league baseball umpire

Have you ever tried to hire a new employee? While looking for a job is tough, finding a good employee is no picnic either. Picture yourself as the CEO of a small to midsize company looking for a new CFO. After carefully constructing your ad, you wade through scores of resumes, schedule and conduct several rounds of interviews, screen the princes from the frogs, and hope when you choose the best candidate, he will say yes. For a busy executive, this can be a long, expensive, and nerve-racking process with no guarantee of a positive result.