When faced with a decision, there's more than one way to express the act of "deciding upon" something. Some synonyms for the phrase include "choosing," "opting for," "selecting," "picking out," "settling on," "making up one's mind," "determining," "resolving," and "coming to a conclusion." Each of these phrases conveys the idea of making a choice or decision, but they may differ in tone or emphasis. For example, "settling on" suggests a final decision after weighing options, while "making up one's mind" implies a process of internal deliberation. Whatever your preferred phrasing, the goal is always to reach a decision that feels right for you.