Text Block Simple is a single rich-text area (a Text Block field, with an AI writing button and a Full Size toggle) — ideal for articles, legal pages and blog bodies; it's also the module the AI blog writer fills automatically. Text Block (a separate module, also in the General category) is a styled section with Title and Subtitle subsections (each with its own font size, color, font family, weight and alignment), a background/gradient option, and margin controls — meant for marketing-copy sections rather than long articles. Pick Simple for long-form content and the styled one for landing-page sections.