Replying to
@wendyg@mastodon.xyz @paulox@fosstodon.org @standardebooks@mastodon.social
I believe Standard eBooks does more work formatting the ebooks they provide. Also, last time I looked for something on Project Gutemberg I only found a .txt file for what I was looking for, the .epub format provided by Standard eBooks is a lot more ergonomical for use cases like mine, reading on different devices. Regarding just the availability of material, I'd suppose Project Gutenberg has more stuff available, if only for the less amount of work involved.