The benefit of Aider is that you can configure a very involved static analysis toolchain to edits which directly triggers new edits in response, and everything is a git commit so it's easy to revert bad edits quickly. I have used both and I find Aider provides more control and produces code faster due to leaner prompts (it's also easier to run multiple Aider instances than Cursor instances), while Cursor has a prettier interface, and I do like being able to see diffs live in files (though I almost never spend the time reading them to accept/reject). I imagine if you don't spend any time configuring Aider cursor would probably seem far better.