The generative AI boom has led to significant success for chip designer Nvidia and software and services company IBM. However, when considering which company is a better AI stock in the summer of 2024, there are some key differences to consider. Nvidia has experienced tremendous growth in AI, particularly with the success of ChatGPT, an AI brain built around Nvidia chips. The company has become a leading supplier of AI accelerator hardware, with its sales skyrocketing and its stock price increasing significantly. However, there are concerns about Nvidia's valuation being overinflated, and some investors may consider waiting for a significant stock price correction before investing. On the other hand, IBM has taken a different approach, focusing on software and services rather than hardware.

The company has been slower to receive credit for its AI prospects but has started to generate significant sales from its AI solutions under the Watson brand. IBM's growth may be more steady and sustainable, particularly due to its long-term software contracts. Additionally, IBM's valuation ratios appear more favorable compared to Nvidia's. In conclusion, while Nvidia's growth is impressive, its valuation may be too high, while IBM offers a more stable growth story with its strategic shift to software and services paying off. Therefore, investing in IBM may be more attractive for those seeking a long-term investment in the AI sector.