Jimdo delivers a way for you to build a beautiful website and have it optimized for the search engines. Your Jimdo experience starts by picking the design for your site; then you’re led through the process of having your site launched to the world. Jimdo is also a hosted solution, which means that they take care of the technical details and giving your site a home.
Just imagine Medium shuts down as did Posterous back in the days (which was a similar service). You will not necessarily lose all your content but all the SEO rankings you ever created. To get it right you need to publish on your own domain name and preferably on your root domain (www.yoursite.com/blog) and not a sub-domain (blog.yoursite.com). This has numerous SEO advantages.
If you don’t have a design muscle in your body, you might experience some difficulties making a Squarespace site look good (due to the platform’s reliance on good stock imagery to be part of your site’s final look). Also, Squarespace offers a good range of features from the get-go, but above that, there’s not much you can do when there’s a feature missing. Just like with Wix, if you want a site that can grow alongside your business, this might not be quite the solution you’re looking for.
Finally, I would like also to draw attention to another interesting CMS that I used a decade ago and really enjoyed using at the time: it was originally known as Article Manager, and its current incarnation is CMS Builder, from InteractiveTools (a company based in Vancouver). At the time I was using it, I remember that the developers were very helpful, and the forum was lively and helpful too. Now that I am using WP, I would not really consider moving to CMS Builder (although I own a license), since WP offers much more in my view. But some people might have reasons to prefer it. However, one should pay attention to the fact that some of the add-ons can make it more expensive than the initial $200 price for a single site.
Squarespace Alternatives: Are WordPress Page Builders A Good Alternative?