Pick AdonisJS for
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Maturity
Years of production use, stable releases, and thorough documentation. Stacks is younger and moving faster, which cuts both ways.
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Lucid
A well-designed ORM with hand-written migrations, which some teams prefer precisely because they are explicit.
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Node ecosystem
Runs on Node with the whole npm operational tooling story behind it, where Stacks targets Bun.
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Focus
Adonis does the backend and stops, which is a virtue if you already have a front end you are keeping.