's (NASDAQ: AAPL) initial launch of the iPhone was arguably a once-in-a-generation investing opportunity. The world changed afterward -- and Apple's share price skyrocketed.

Many investors probably also view the introduction of ChatGPT as a once-in-a-generation investing opportunity with Nvidia (NASDAQ: NVDA). The demand for the company's graphics processing units (GPUs) in powering generative artificial intelligence (AI) applications took off and hasn't slowed since.

By definition, such moments with Apple and Nvidia are rare. However, no rule says a company can't have multiple game-changing catalysts during its lifetime. Perhaps both Apple and Nvidia are once again presenting once-in-a-generation opportunities. If so, is Apple a better pick than Nvidia for investors right now?

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Source Fool.com