I ran both tests. Two different phones, Motorola G5 Plus and Google Pixel 4a. And three different apps, MyTracks, SpotLens, and GPS Camera Map. I don't have Solocator on either phone because it's not free.
The attached picture shows the results. A bit of a mixed bag. The Motorola results (yellow) would indicate that it depends mostly on the phone and not much on the apps. The Pixel4a results (green) would indicate the opposite.
The white Google Earth circle is where I was standing. Note that this doesn't mean GE is correct. I put that circle on the correct spot, and based on that the GPS coordinates the phones gave resulted in waypoints where they are shown. It's possible that Google Earth coordinates are all 20 feet too far south, and if that's the case then the 4 circles clustered together would be very close to correct. We have no way of knowing the correct answer. We can only do comparisons.
