The author switched from using WordPress to Squarespace for building clients’ websites due to several reasons. Squarespace is simpler and more user-friendly, enabling clients to make simple changes without relying on a developer. Squarespace’s design and functionality emphasise clean and functional sites, while cost effectiveness is also a factor, with discounts for annual plans and different pricing plans. Squarespace also offers more security, with less risk of getting hacked and no need for daily backups. In summary, Squarespace is easier to use, cost-effective, and more secure than WordPress.