I need to start a blog. Substack? What's the most strategic choice for solid distribution?

Web3 newsletters & publishing.

We automatically summarize and cast about the best posts on Paragraph.

solidity & product. i interview crypto builders @ web3galaxybrain.com

If you care about crypto wallets (wallet subscriptions, distributing via NFTs your content) = @paragraph 

If you want to discover a new audience, eventually a premium subscription and ease of use (takes time but works) = Substack

If you want to focus on growth (paid ads), automating your content and have different revenue streams (Web 2) = Beehiiv

I don't recommend Medium

Other options to explore (I think the first 3 are better)
Kit / Ghost