"Pitch upon" is a phrase that means to choose or select something. However, there are several other ways to express this action with various synonyms available. One alternative is "opt for," which has a more conversational tone. Another is "elect," which is more formal and may indicate a more significant decision. "Pick" is another common synonymous term, and it can be followed by a preposition that clarifies the choice's specifics, such as "pick out" or "pick from." Lastly, "decide on" and "settle on" are also useful options when one is looking for a phrase that denotes making a final choice with conviction.