If your goal is long-term topical authority + publishing detailed case studies + being discoverable in AI-generated search answers, I’d prioritize platforms that give you ownership of the domain, strong internal linking, structured content, author information, and clean technical SEO.

My shortlist

Platform	Topical authority	Case studies	AI discoverability	Ownership/control	Best fit
WordPress	★★★★★	★★★★★	★★★★★	★★★★★	Maximum SEO/content flexibility
Ghost	★★★★★	★★★★★	★★★★★	★★★★★	Publishing + newsletter + authority
Webflow	★★★★☆	★★★★★	★★★★☆	★★★★☆	Content + sophisticated business site
Substack	★★★☆☆	★★★★☆	★★★☆☆	★★☆☆☆	Newsletter-led publishing
Medium	★★☆☆☆	★★★★☆	★★★☆☆	★★☆☆☆	Additional distribution
LinkedIn	★★☆☆☆	★★★★☆	★★★☆☆	★☆☆☆☆	Professional distribution

Important distinction: there isn't a special "AI-search blogging platform." AI systems can discover and use content from many platforms. The more durable advantage comes from having original, authoritative information on a crawlable site, with clear authorship, structure, entities, citations, and a coherent body of work.

1. WordPress — maximum control

For a serious knowledge site, WordPress gives you the broadest set of options.

Its native architecture supports things important for topical authority: hierarchical content, categories, tags, custom URLs, feeds, sitemaps and extensive SEO customization. WordPress.org

It's particularly strong for case studies because you can build a content architecture such as:

/industry/
/industry/topic/
/case-studies/
/case-studies/company-x/
/research/
/guides/
/authors/

You can then connect related concepts through internal links and create dedicated author, methodology and research pages.

Choose WordPress if: SEO and content architecture are more important than having the simplest publishing experience.

WordPress

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2. Ghost — arguably the cleanest publishing setup

Ghost is especially interesting if you're building a research publication, expert blog, or founder-led knowledge hub rather than a huge conventional website.

It provides built-in SEO features including metadata, XML sitemaps, canonical URLs and structured data. Ghost

It also combines:

• Website publishing
• Author/content publishing
• Newsletters
• Memberships
• Paid subscriptions
• Analytics
• Custom domains

That combination is unusually useful if your strategy is:

Publish authoritative research → build an audience → turn readers into subscribers.

Ghost also supports multiple newsletters and audience segmentation. Ghost+1

Choose Ghost if: you want an owned publication rather than a conventional CMS-heavy website.

Ghost

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3. Webflow — strong for content + brand

Webflow makes more sense when the blog is part of a larger marketing/business website.

For example:

Company website
├── Services
├── Industries
├── Case Studies
├── Research
├── Insights
└── Blog

That can be a very effective authority structure because your research, commercial pages and case studies can reinforce each other.

The trade-off is that WordPress generally gives you a larger ecosystem for sophisticated publishing and SEO customization.

Choose Webflow if: design, brand presentation and the integration between marketing pages and editorial content are major priorities.

Webflow

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4. Substack — excellent distribution, weaker as your entire SEO property

Substack is attractive when the newsletter itself is the product.

It's much less attractive if your primary objective is building a highly structured knowledge base around a topic.

I'd think of it as:

Newsletter → Substack

rather than:

Complete topical-authority website → Substack

If you use it, I'd consider maintaining your primary research library on your own domain and using Substack as a distribution channel.

Substack

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5. Medium — useful distribution layer

Medium can expose your writing to an existing readership, but I wouldn't make it the foundation of a long-term topical-authority strategy.

Your strongest assets—original research, proprietary case studies, frameworks, data and detailed guides—are generally better housed on a domain you control.

Think:

Your website = canonical knowledge base

Medium/LinkedIn/etc. = distribution

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What actually matters for AI discoverability

The platform is only part of the equation.

Google explicitly supports Article/BlogPosting structured data and recommends information such as the author, author URL, headline and publication/modification dates to help systems understand articles. Google for Developers

For your site, I'd therefore build every substantial article around something like:

1. Clear author

Jane Smith — Head of Growth 12 years in B2B SaaS

2. Original evidence

We analyzed 147 customer implementations...

3. Specific methodology

Data was collected between January–June 2026...

4. Primary findings

Finding #1: ...

5. Supporting evidence

Tables, screenshots, data, quotations, references.

6. Interpretation

Explain why the finding matters.

7. Related content

Link to your other articles, case studies and research.

8. Clear update history

Published: March 2026 Updated: September 2026

That creates something considerably more valuable than generic "SEO content."

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My practical recommendation

If you're starting a new authority site today, I'd narrow it to:

WordPress

Choose this if you want the most flexible SEO/content architecture and expect the site to become substantial.

Ghost

Choose this if you want a focused expert publication + newsletter + membership ecosystem with less CMS complexity.

Webflow

Choose this if the blog is primarily an authority layer around a sophisticated company website.

And regardless of platform, I'd use your own domain as the canonical home for your best material.

A particularly strong architecture would be:

example.com/

├── /topics/
│   ├── topic-a/
│   ├── topic-b/
│   └── topic-c/
│
├── /case-studies/
│   ├── company-a/
│   ├── company-b/
│   └── company-c/
│
├── /research/
│   ├── original-study/
│   └── industry-report/
│
├── /guides/
│   ├── definitive-guide/
│   └── implementation-guide/
│
├── /authors/
│   └── your-name/
│
└── /about/

That structure is more consequential for topical authority and machine understanding than whether you pick WordPress versus Ghost.

If I were designing specifically for your three goals—topical authority, case studies, and AI discoverability—I would shortlist WordPress vs. Ghost first. WordPress gives you more architectural flexibility; Ghost gives you a cleaner publishing/newsletter system. Ghost+2Ghost+2