Rather than telling you, here's a simple question to ask yourself:
What incentives exist on this job board?
If a company has to pay money to advertise on a job board, it's more likely to be a "good job board" because recruiters have to spend money to keep their job post active.
If a company doesn't have to pay money to advertise on a job board, it's more likely to be a "bad job board" because it's free to use.
Example:
My company careers site has job posts that haven't been taken down yet even though we filled them.
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