Based on our record, Duplicator Pro seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
2, The logical way would be to develop the site on a staging/ dev server then move it to their live site when ready. A few things, again, need to be considered, but, for a straightforward swap, you can use a plugin like Duplicator Pro to 'duplicate' your updated version and overwrite the live site when ready. Source: over 2 years ago
Launchrock - Setup a viral "Launching Soon" page in minutes to attract potential customers and promote your site's launch.
UpdraftPlus - UpdraftPlus is a WordPress backup plugin.
Unbounce - Unbounce lets marketers and businesses build, publish and test landing pages without IT or software. AI enhanved A/B testing and lead gen make it a powerful marketing tool.
All-in-One WP Migration - Migrating WordPress sites is a challenging and growing process.
Clickfunnels - Optimize sales page with a simple drag-n-drop interface
WPvivid Backup - Wordpress Developer