So ... Let's see ...
Those magic blocks
As I said, Gutenberg’s blocks will allow you to add different content types to your posts and pages.
And we have several block categories. Here they are ...
1. Common blocks
1.1 audio = you can use it to embed a simple audio player
1.2 cover = will add an image or video with a text overlay
1.3 file = will create a link to a downloadable resource
1.4 gallery = will display multiple images in a rich gallery
1.5 heading = adds H1-H6 heading text
1.6 image = will insert an image
1.7 list = adds a bulleted or numbered list
1.8 paragraph = adds a basic paragraph text
1.9 quote = will create a quoted text visual emphasis
1.10 video = you can embed a video from your media library (or to upload a new one)
2. Formatting blocks
2.1 classic = will allow you to use the classic WordPress editor
2.2 code = will allow you to display code snippets
2.3 custom HTML = adds a custom HTML code (and live preview)
2.4 preformatted = adds a text that respects your spacing and tabs and allows styling
2.5 pullquote = will create a special visual emphasis to a quote from your text
2.6 table = inserts a table
2.7 verse = will allow you to use special spacing formats for poetry, song lyrics, etc
3. Layout element blocks
3.1 button = adds a custom button
3.2 columns = adds a block that displays content in multiple columns
3.3 media & text = will allow you to set media and words side-by-side
3.4 more = will allow you to define where you want the separation in your excerpts
3.5 page break = you can use it to create multi-page posts
3.6 separator = a horizontal separator for creating breaks between ideas or sections
3.7 spacer = adds a white space between blocks (with customizable height)
4. Widget blocks
4.1 archives = displays a monthly archive of your posts
4.2 categories = displays a list of all your categories
4.3 latest comments = displays a list of your most recent comments
4.4 latest posts = display a list of your most recent posts
4.5 shortcode = will allow you to insert custom elements (using a WordPress shortcode)
5. Embed blocks
The embed blocks will allow you to embed videos, images, tweets, audio, etc from different external third-party sources.
Supported platforms: Twitter, YouTube, Facebook, Instagram, WordPress, SoundCloud, Spotify, Flickr, Vimeo, Animoto, Cloudup, CollegeHumor, Imgur, Issuu, Kickstarter, Meetup.com, Mixcloud, Photobucket, Polldaddy, Reddit, ReverbNation, Screencast, Scribd, Slideshare, SmugMug, Speaker Deck, TED, Tumblr, VideoPress and WordPress.tv.
Should I continue to use SiteContent or just go straight to Gutenberg for my blogging?