선택하다(seon-taek-ha-da, seontaekhada)
The act of consciously and formally deciding among multiple options
When to use
Formal decision, Important choice, Documents or presentations
The nuance
Used mainly in important or formal situations when making careful decisions. Suitable for written language or formal contexts.
고르다(go-reu-da, goreuda)
The act of picking or choosing one among several options in a relatively natural and everyday manner
When to use
Everyday choice, Informal situations, Shopping or choosing food
The nuance
Used mainly in everyday, informal situations when simply picking one among options. Suitable for spoken language.