It's a given that the Samsung flagship smartphones have two different chipsets given to different countries. For example for North American countries, their Samsung Galaxy S20 comes with the Snapdragon 865 chipset, while those of us in Europe and Asia get the Exynos 990 chipset. There's no doubt that the Exynos chipset is relatively inferior to Qualcomm's Snapdragon, which is likely a why a petition has started for Samsung to stop using said chipsets.
The petition was started by Daniel H. a few days ago, stating “phones with Exynos SoC chips are shown to perform slower, have less battery life, use inferior camera sensors and processing, overheat and throttle faster, amongst other issues.”
The petition linked a few references that revealed the Galaxy S20 devices using the Exynos 990 chipset have slower CPU and GPU performance, higher clock speed throttling, inefficient heat management, and worse battery life in comparison to the the Snapdragon 865 chipset.
Samsung has been using Exynos chipsets as it's their own proprietary chip, giving them increase profit margins as well as being able to competitively price their devices against an increasingly competitive market. Unfortunately, it just can't perform as well as the Snapdragon.
As of this writing the petition has already garnered 20,000 signatures, and if you agree and want to contribute for this cause, you can find the petition here.