Substack and Blogizi aren't really solving the same problem, which makes this less "which is better" and more "which growth channel are you actually building for." Substack is optimized for the inbox; Blogizi is optimized for the search results page. Both are legitimate strategies, and they compound differently over time.
For the wider landscape, see best developer blogging platforms.
What Substack gets right
Every post goes straight to a subscriber's inbox, which is a direct, high-attention channel no organic search strategy can match in the short term. Paid subscriptions are built in, so turning writing into a business is a native feature rather than something bolted on. Substack's discovery network (recommendations, the app's reading feed) can also surface your writing to new subscribers.
Where it costs you
Substack posts do exist on the web at yourname.substack.com or a connected custom domain, but the product isn't built around search ranking — there's no deep technical SEO tooling (structured data, fine-grained canonical control) because that's not what the platform optimizes for. Growth is driven by subscriber count and open rates, not organic traffic, and content still lives inside Substack's platform rather than as files you fully own.
Where Blogizi differs
Blogizi is built for the opposite growth model: posts as Markdown files with frontmatter, published with blogizi publish path/to/post.md — see blogging from your terminal — with sitemaps, canonical URLs, and OG images handled automatically so the content is built to rank and compound in search over time, covered in the technical SEO checklist. There's no built-in email delivery or subscription monetization — that's simply not the growth channel it's optimizing for.
The actual decision
Pick Substack if: your growth strategy is a direct subscriber relationship — building a list, delivering to the inbox, and potentially monetizing through paid subscriptions.
Pick Blogizi if: your growth strategy is organic search — content that keeps getting found on Google for years after you publish it, on a domain you own outright.
Consider both if: you want the inbox relationship and the long-term search asset — nothing stops you from running a Substack alongside a Blogizi-hosted blog, cross-linking between them.