Substack vs. Blogspot: Which is more popular?

Which among "Blogspot.com"  and "Substack.com" is the most popular blogging platforms?

Here’s a strategy I tried.

I searched for 'blogspot.com' on Twitter (now X) and checked the top posts. This gave me a look at the leading user comments that included links to blogspot.com, helping me gauge Blogspot's popularity on the platform.

Similarly, I did with Substack...

The result was clear. 

Substack.com's popularity on social media is higher.

Top X users preferred Substack over Blogspot.