As per the usual timeline, the Snapdragon 8 Gen 4 is expected to launch sometime this October. But it's not the only flagship chip expected to use the 3 nm process. Samsung will also reportedly be bringing its Exynos 2500 with the same process design, and according to the latest leak, it will apparently be outclassing Qualcomm's upcoming flagship SoC in terms of power efficiency.https://www.notebookcheck.net/Leak-claims-Exynos-2500-of-Samsung-Galaxy-S25-will-beat-Snapdragon-8-Gen-4-in-power-efficiency.838712.0.html
I think you mean "Historically, Qualcomm's chips have been more powerful, while Samsung's Exynos tends to be cheaper and less power efficient.'