Fahrenheit is best for ambient temperatures. 0 F is what humans feel is a very cold day, and 100 F is what humans feel is a very hot day.
Celsius is best for literally everything else, but for humans feeling of ambient temperature Fahrenheit is best
There are 2 different categorization systems - botanical and culinary. Both are valid systems for their topic, but ONLY for their one topic. Calling a tomato a vegetable is the correct answer for cooking, but the incorrect answer for botany, and vice versa.