Beyond just ensuring that your resume looks like all the other resumes out there, templates are also generated as "one_size_fits_all" solutions. Do your career, your unique work experience, and your individual goals really fit in a one_size_fits_all format? For the vast majority of people, the answer will be no. Very few professionals have a completely linear, untarnished employment history. If there are any 'problems' in your background__such as a period of unemployment, too frequent job changes, a demotion, or any number of other challenges__a resume template will only accentuate and call attention to the negatives.
You would also be wise to locate a template offered by a company that will also help you write a cover letter for your resume. Some jobs will need a cover letter to accompany the resume. The best kind of template to use is one that will give you a template for the resume itself and a template for the cover letter. That way you have the help you need to write both of these professionally. That is essential for having a good shot at being hired for the job that you want to get. A poorly written resume will only harm your chances of being hired by the employer.