I run the same tests with all AI writers to see what type of output it gives and it ranges from minor grammar mistakes to repeated sentences to sentences/paragraphs that make absolutely no sense. So, make sure you read ALL output text and edit as needed. This is true for all not just Texta or ArticleNinja.

Texta.ai tools:
The long form section has 13 blog post generators (most industry-specific, like Real Estate) BUT based on the tests I've ran, aside from minor variations, they were very similar in output. So I would group those as one tool.

Then you have Blog ideas, Blog Titles, Headline Generation, Blog Intro, Essay Intro, and Paragraph Generation. The Blog Titles and Headline Generation would consider the same tool and the intros and Paragraph Generation also be the same.

Short form tools: Product Description, Facebook Headlines, Video Title Generator, Ad Copy, Facebook Primary Text, Google Headlines, Google Description, LinkedIn Ads, Value Proposition, Brand Mission, Startup Ideas, Text Hook, Slogan Generator, Product Hunt launch, Video Titles, Video Intro Hook, Subheader Text, Meta Descriptions, Question Generator, Event Description, Marketing Strategy, Feature to Benefit.

Again, with short tools as well, different tools have similar results.

Email tools: Welcome, Follow up, Confirmation, and Thank you generated decent output.

ArticleNinja tools:
The main tool is their Article Writer, which generates titles, then generates outlines, and then article content.

Short form tools: Product Description, Facebook Primary Text, Facebook Listicle, Facebook Headlines, Google Headlines, Google Description, LinkedIn Ads, Ad Copy, Video Title Generator, Value Proposition, Slogan Generator, Brand Mission, Audience Refiner, Name Generator, Domain Name Generator, Startup Ideas, Video Titles, Text Hook, Subheader Text, Landing Page Hero Text, Microcopy, Meta Descriptions, Question Generator, Marketing Strategy, Problem-Agitate-Solution, Before-After-Bridge, Feature-Advantage-Benefit, Why/Try/Buy, AIDPPC, ACCA, QUEST Strategy, Feature to Benefit, AIDA Copywriting.

Like Texta, some tools overlap and are virtually the same.

So which should you go with?
Depends.

I found the Texta long form/blog generate output was better than ArticleNinja's Article Writer but you still need to read and edit most of it. ArticleNinja's output most of the time was complete non-sense.

Texta offers unlimited credits vs limited credits with ArticleNinja for long forms.

ArticleNinja offers more tools for sales copies than Texta.

If long forms are more important, Texta is a better choice.
If sales copies are more important, ArticleNinja is a better choice.

Personally, I won't keep either because it's odd to me that the company behind both is the same, and instead of sticking to one, they have competing products. It's just giving me the Botstar/Chative vibe, which a lot of people including myself got burned.