If it was ambiguous, these digital tests may have told you it was negative even when it would be positive a day or two later. You might have slept better but it wouldn’t have been based on accurate data.
The second test had more clear instructions about "read results after X minutes, ignore any changes after that time". The electronic test wouldn't have had a visible line after 10 minutes that scares young college students when they think they can see the shadow of a second line if they hold it to the light the right way.