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For small projects like this either one would probably be fine. Hell, you can try implementing with both just to see what you like and don't like from each.

I suppose switching depends in part on how much work that would be.

That said, I tend to pick Postgres as a default because using JSONB columns I can get the benefits of 'NoSQL' and switch over to 'SQL' while staying within the same database.

I don't think you'll benefit from switching either way, but in my opinion you'll benefit from learning Postgres when you have the time / start a new project.