Choosing DEM in France?

What is the most accurate DEM data?

The DSM dataset has a horizontal resolution of approximately 30-meter mesh (1 arcsec) and is available to the public for free. Based on the DSM dataset (5 meter mesh version) of the World 3D Topographic Data—the most precise global-scale elevation data with world-leading precision of 30 meters.
 

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What is the most accurate DEM data?

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