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The Workbench lets you nominate which source it should trust. Three separate choices, in fact. Most people do not need to touch any of this.

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The test

1

Count the wearables you actually wear

A watch, a ring, a band, a chest strap. Not scales — those measure something nothing else does, so they never compete.
If the answer is one, or none: you are done. Skip the next two pages entirely. The app has already picked the only thing available, and there is nothing to improve. If the answer is two or more: the next two pages are worth five minutes. Read on.
This is genuinely the majority case, and it is a good thing. Remember that the person with one low-cost device is our canonical user. A simple setup is not a limitation here.

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Why the option exists at all

Because when two devices measure the same night, they will disagree — sometimes by a lot. The app cannot show both without becoming useless, and picking arbitrarily would be worse. So it asks. That is all this feature is. With one device, there is nothing to ask.

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One thing to check even with a single device

If you own one wearable but it reaches the app through a hub — Apple Health, say — the hub may be handing over data from several devices without you realising. Your phone counts steps too, and an old device may still be writing. That case is covered in When several wearables arrive through one hub, and it is worth a look even if you think you have a simple setup.