XStore is a modern theme and yes, it’s advanced than Legenda.
XStore has live options from WP Customizer, there are more options for the detailed customization of many theme aspects. XStore includes header builder, variation swatches, variation gallery, single product builder. It supports 2 page builders: WPBakery and Elementor.
Both themes are WooCommerce themes and both support the WPBakery, so, don’t think that you will spend a lot of time to switch, maybe a few days or week, depending on your skills. Probably it will be the re-creation of the home page (or other pages if you used specific Legenda elements like product categories or something not the default WPBakery elements) using XStore elements and footer creation. You can create staging site(full copy of the existing) to check.
