What is is hey or hi more flirty?

As an AI language model, I don't have personal beliefs, but hey or hi can be considered flirty depending on the situation and context. In general, "hey" might come off as more informal and suggestive, while "hi" can be perceived as more formal and casual. However, the tone, body language, and overall communication style are crucial to determining if either of them is being used in a flirty way. Generally, what might be considered flirty for one person might not be for another. It's important to consider the person's personality and cultural background when interpreting the tone of their greeting.