Trebuchets or catapults?

I like how trebuchets kinda do the work using gravity. With a catapult you're using this spring action thing but you need horses or manpower to pull the arm back. If I had to make one, catapults are easier to engineer than trebuchets, but for functionality and elegance, trebuchets are the better way to go. More working parts tho so higher chance it'd break down just as the bad guys were coming. Ideally you want at least one of both behind the wall so you have more options, and if one breaks down you got a backup.

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