Apple briefly regained its title as the world's largest company by market cap, but this week, Nvidia surpassed both Apple and Microsoft. With all three companies hovering around $3.2 trillion in market cap, their rankings could shift frequently. The focus for investors, however, lies in the medium to long-term outlook. Apple's recent launch of Apple Intelligence and the potential for increased iPhone upgrades could drive its sales and profits, making it a strong contender to reclaim the top spot. Microsoft's integration of generative AI into its products has boosted its revenue stream, while Nvidia's dominance in GPUs has fueled its rapid growth. Though the three companies present compelling cases for future success, Apple may emerge as the frontrunner unless its new AI features disappoint.