I have used several top AI writing tools. All are constantly evolving with new features.
But, At this point in time, Outranking is the best tool for long-form content creation. I like it so much that i have also subscribed to a monthly add-on. Here is what makes it outstanding for me -

( 1 ) Comprehensive Outlines with Keywords - i used tools which are specific for keyword research and compared the results with outranking. Outranking pretty much showed all the valuable keywords, questions, headings across its various sections. So it saves time, makes it easy and great to start even if you didn't do much keyword research.

( 2 ) Contextual Output - When i wanted to write something specific about a topic, "what-why-how-when" ..... outranking gave me by far the best results. Other tools were writing generic information about the topic that was not relevant to what i was seeking in a heading. But pretty much every output from Outranking was on point.

(3) Quality Output - When output is no fluff and on point, you can save more time, mental energy and focus on getting a quality article. I was getting frustrated writing and deleting in other tools.

( 4 ) Ideas and Perspectives - As i keep writing in Outranking, i often discover so many new ideas and content on a topic. Many times, i could turn an entire section/heading into a complete new article too.

( 5 ) Smart Team - Just in a few months, the Outranking team have developed it from a newbie to a top-of-the-league tool. They have proved they can develop features-functionalities to stay ahead and provide quality value. Also their weekly webinars have been useful to learn more about content writing and the tool.

Improvements - Tone Options, UI looks and Rewriting / Rephrasing need some improvement.

Recommendation - Get the high Tier. You can definitely produce quality articles quickly that will impress your clients. You can get more orders and get the add-on to write more. If Quality content is your priority, don't miss this.