From a working web designer who keeps seeing the same three mistakes: people pick a platform that doesn't fit, get blindsided by hidden costs, or chase AI hype without knowing what they're signing up for. This guide is the post I wish every business owner could read before they sign up for the wrong platform. It covers 14 of the most relevant builders in 2026, with honest pros and cons, realistic costs (not just headline prices), and who each platform is best for.