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You can check which one is working easily.
Puit a broom handle into ground vertically use a bubble level to make sure it's straight up. Or use a plumb bob line.
Use some software like the sky. Make sure time and lat long are accurate for your location. Click On the sun. It will give you info like rise set and transit time. Transit is what you want. At that exact time of transit look at the shadow cast by your plumb bob or stick. That is true south. Mark it with tape or ground marking spray.
Now you can check your compass against that. Bearing in mind magnetic north south will differ by the magnetic declination for your location.
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