I know a lot of people, including me, who start designing their websites with Wordpress and then make the switch to Squarespace and wish they had done it sooner.
I am the same… When I switched my own site from Wordpress to Squarespace and then started designing all my clients sites on Squarespace I wished I had done it sooner and not contemplated for such a long time. There were so many things that were suddenly easier for me. And especially the handover process of a finished website with my clients was so much easier as they actually understood how to update their website much quicker. Consequently I got a lot less maintenance questions afterwards :-) Although I still sometimes design on Wordpress or work with Wordpress I am reminded every time I do it, why I prefer Squarespace.
So I decided to write down the main reasons why I prefer Squarespace over Wordpress. And why I recommend Squarespace over Wordpress to most of my clients.