Honestly, mainly just due to our existing familiarity with Rails and its huge ecosystem. We knew we'd be carrying out a wide array of tasks on the server, and there's a gem for everything.
I know this is largely true for the Node/Typescript ecosystem as well, but I've personally found Rails to be more plug-and-play.
They’re probably about equal when it comes to availability of plug n’ play libraries. Note: a lot of teams find that they’re more productive when they can use the same language throughout the whole stack.
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