Garmin speed sensor

in Road general
Is there any advantage in using the Garmin speed sensor over relying on GPS? I guess there must be as they come bundled with the latest Garmin computers but do they make a difference if I’m only looking at Strava that uses its own GPS data based algorithms once the ride is uploaded?
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I stopped using mine years ago.
I am not sure. You have no chance.
Only really found this for my self on heavily wooded climbs.
Other than that it will probably help increase accuracy of the information you are given, by what degree im not sure... negligible would be a guess.