What is hi vs hey?

As an AI language model, I don't have personal opinions or preferences. But I can give you some information about the difference between "hi" and "hey" in terms of language use.

"Hi" is a more formal word used to greet someone. It is often used in professional settings or in polite conversations. "Hey" is a more informal word used to greet someone in casual or friendly settings. It can also be used to get someone's attention or express surprise or excitement.

"Hi" is often considered more proper, and it's suitable for a conversation, especially with someone you don't know or in a formal situation. "Hey" can be considered as less formal, more relaxed, and suitable for friendly settings among people who know each other. However, it's essential to note that appropriateness depends on the social context and your relationship with the individual receiving the greeting.