WordPress is an amazing platform for SEO, because it's built on the presumption you will be putting out content and is optimized for that, as well as it has a ton of awesome open-source tools that a vibrant community has built to support it's 'lead' in the SEO space. Any platform that allows for clean code, and content rich design + ease-of-use for teams can be a great platform for SEO though. Many SEO teams promote WordPress and Yoast, or WordPress and the Rankmath plugin because that's what they know. Ahrefs is a great platform for keyword research and the competitive analysis part of SEO, as well as technical audits. Sitebulb, and Screaming Frog are well-respected when it comes to deeper technical analysis of websites.