If you want to buy the best smartphone for gaming you need to think abot a couple things like: performance, display quality, battery life, and additional gaming features.
However, some smartphones stand out for their exceptional gaming capabilities.

Asus ROG Phone series: Asus ROG (Republic of Gamers) Phone series is specifically designed for gaming enthusiasts.
These phones feature high-refresh-rate displays, powerful processors (such as Qualcomm Snapdragon 800 series), advanced cooling systems, and customizable gaming features.

Apple iPhone series: iPhones like iPhone 13 Pro and iPhone 13 Pro Max, offer excellent gaming performance thanks to their powerful A-series chips, high-quality displays, and optimized software. Additionally, the App Store offers a vast selection of high-quality games.

Samsung Galaxy S21 Ultra: Samsung’s flagship Galaxy S21 Ultra boasts top-tier specifications, including a high-refresh-rate display, powerful processor options (Snapdragon 888 or Exynos 2100), and large battery capacity, making it well-suited for gaming.

OnePlus series: OnePlus smartphones, especially models like OnePlus 9 Pro, offer high-performance hardware, smooth displays, and optimized software, providing an excellent gaming experience.

Xiaomi Black Shark series: Xiaomi’s Black Shark series focuses on gaming performance, featuring powerful processors, large batteries, and unique gaming-oriented design elements like physical triggers and enhanced cooling systems.

Sony Xperia 1 II and Xperia 5 II: Sony’s Xperia smartphones offer excellent gaming experiences, particularly for users interested in PlayStation gaming integration and features like Remote Play.

When choosing a smartphone for gaming, you need to think about the budget, preferred gaming genres, and specific features that matter most to you, such as display refresh rate, battery life, and gaming accessories compatibility.