When comparing Blogger vs Squarespace, the Slant community recommends Squarespace for most people. In the question“What are the best solutions for a personal blog?” Squarespace is ranked 9th while Blogger is ranked 19th. The most important reason people chose Squarespace is:
Squarespace's WYSIWYG tools are intuitive and support drag & drop functionality allowing you to change existing layout or add an article quickly.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro No ads
You can turn on ads if you want, but you can also keep your Blogger blog ad-free. That is different from WordPress.com (free hosted WordPress) where there are ads, and you cannot do anything about it.
Pro Free
hosted by google
Pro Javascript friendly
You can include Javascript snippets and widgets (like Pinterest widgets for example) in posts and in sidebar items. This makes it very different from WordPress.com (free hosted WordPress) which does not allow javascript plugins.
Pro Every Google account has one
If you have a Google account from any other of their services, such as Gmail, Youtube or Google+, you automatically have a Blogger account as well.
Pro Supports multiple authors
Multiple people can contribute to a single blog.
Pro Custom domain support
You can use either your own URL or a *.blogspot.com URL.
Pro API
The Blogger API allows you to publish and manage your content via a custom client app
Pro Allows custom advertisements
Such as project wonderful, or just google adsense,. so you can make money from your blog.
Pro Android and iOS mobile apps
Allows viewing and editing content from your mobile device.
Pro Analytics integration
There's very basic analytics, but you can upgrade if needed.
Pro Easy to customize & update
Squarespace's WYSIWYG tools are intuitive and support drag & drop functionality allowing you to change existing layout or add an article quickly.
Pro Responsive templates
Squarespace templates offer an optimal viewing experience depending on the width of the browser window so they will work and look great both on desktop and mobile devices.
Pro Lots of flexibility
Squarspace allows complete creative control over how you want your website to look and function. It can be a complete website.
Pro Extensive styling options
Pro Detailed real-time metrics
Squarspace offers detailed metrics, that can also easily be accessed from your phone via an iOS app.
Pro Attention to detail
Squarespace has a bunch of small nice-to-haves that make it a pleasure to use, like automatically getting a screengrab when adding a video so that the site doesn't load the whole video before the user has clicked on it, or a sign-up process that's sane among other things.
Pro Lots of good example projects
Squarespace offers a great selection of highly polished templates across a variety of categories and styles.
Pro Great support
Squarespace promises to answer all question within an hour.
Cons
Con Bad post editor
It is a WYSIWYG html editor, and it would be a bit better if it used <p> tags. Instead it uses divs and brs everywhere, which leads to inconsistent or just crappy typography and spacing.
Con Limited authorization system
Sadly the authorization system is fairly limited. Co authors can post and publish, without you getting a chance to pre-check their posts as an admin. e.g. you can't give them "create" and not give them "publish" permissions. They can only edit their own posts however.
Con Can be very slow
Loading times can be huge - results may vary on your use of template, but even a fairly lightweight template can load quite slow.
Con Not fully HTML4 or 5 compliant
And impossible to get it perfectly accepted by the W3C verifier no matter how much you tinker.
Con Dependent on a third-party host
This is dependent on a third-party host, instead of creating a site that you can deploy on your own server.