An attractive resume template/outline makes it more powerful. Just as dressing smartly helps a candidate in an interview good formatting does the same for a resume. Looks do matter at all places in the real world and on paper. When you present yourself well you get noticed. Similarly when you present a good resume it will be noticed; otherwise it would be very easily find a bin to rest in.
A clean clear and attractive template for a resume is appealing showcases the important sections of the resume in a proper way and catches the attention of the readers in a way that they will read all that you have in it rather than reading just a few lines. The more time you gain from a recruiters attention the more are your chances of getting an interview call.
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.