Next.js: App Router front end in front of a CMS or shop
headless - Next.js (App Router) as the front end, WordPress (WPGraphQL / REST) or PrestaShop (Webservice / custom API) as the back end. For content sites and catalogues where the team wants React and the editor stays in the CMS. Not for a shop with a PrestaShop cart without a serious reason (headless checkout = high cost).