The resume that lands you the job interview isnt a simple listing of your past duties or work experience. It has to convince readers that you have the required skills and abilities to exceed the expectations of the position so your resume should be structured in a way that arouses employers interest in you and gives them reasons as to why you are more qualified than others while encouraging the employer to get in touch with you for an interview.
Functional format is best for those who are switching their career or have large employment gaps on their resume. In this format, you dont have to list the joining or resigning dates of the previous employments. Functional format will hide your employment gaps or your job switching.
Instead resume writing services suggest you use a summary paragraph which will include a brief objective component to focus your resume. Yet the summary portion will mostly cover your career highlights capabilities and strongest most in-demand skills.