Is a single page site better for SEO and visitors, or is a site with various pages better?

I americium a freelancer, and I person a mini squad of freelancers that useful pinch maine connected ample freelance Web improvement projects. I americium offering Web design, development, and SEO.

I created a website pinch galore pages that includes my portfolio, astir me, and galore much things. I saw that various freelancers created 1 page website to coming their work, and they are ranking connected nan apical Google pages. My mobility is that arsenic a freelancer, what benignant of website creation is amended to take for SEO and for visitors, a multi-page tract aliases a single-page site?