Should I use a page-builder app or native Shopify sections?

For most stores, native sections (Online Store 2.0) are the better default: they're built into the theme, add no extra app scripts, and are fast. Shopify's section/block system now covers most landing-page needs without a builder.

Page-builder apps are genuinely convenient for non-technical teams shipping lots of custom landing pages quickly, but they inject their own CSS/JS and can drag down speed if overused — and you're locked in (remove the app and the pages break). If you go that route, use it sparingly and keep an eye on Core Web Vitals.