Vue's `v-if` and `v-show` directives have key differences: `v-if` removes the element from the DOM when false, while `v-show` hides it using CSS styles. Choose between them based on performance, SSR considerations, and best practices.
Guide compares Vue’s Options API and Composition API for organizing component logic, noting the Options API’s simplicity and suitability for small/legacy components, and the Composition API’s modularity, reusability, and testability for complex apps; advocates choosing per component, even mixing both, illustrated via a task management system workflow.
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