When faced with a choice between two options, we often use the phrase "one or the other." However, there are several other synonyms that can be used to convey the same meaning. For example, "either" and "any one of" are both commonly used in this context. Additionally, "alternatively" and "on the other hand" can be used to suggest a contrast between two options. "Individually" and "separately" are more specific synonyms that may be used to indicate that the two options must be considered independently. Overall, there are many different ways to convey the idea of choosing between two options, and selecting the right word can provide clarity and nuance to your communication.