The most flexible mainstream builder, and the one leaning hardest into AI: answer a few questions and its AI generates a first-draft site you then refine by dragging things around. A free tier lets you build and publish, with Wix branding and a wix.com address until you upgrade, and its app market adds almost any feature you can name.
All that freedom can mean a busier interface and easier ways to make a messy site than Squarespace allows, and you cannot later export and move a Wix site elsewhere. For beginners who want maximum options and a free way in, it is the obvious pick.