For gaming, I would judge the phone by sustained performance, not the first benchmark run. A fast chip that throttles hard after 15–20 minutes can feel worse than a slightly slower phone with better cooling.
Look for a stable frame rate, good touch response, a bright 120Hz-class display, strong battery life and charging that lets you recover quickly between sessions. Storage matters too: if you keep several large games installed, 256GB is a much safer target.
For heat, compare reviews that test longer gaming sessions on mobile data as well as Wi-Fi. Ambient temperature in Pakistan can make thermal behavior more important than laboratory tests suggest. If camera quality is also important, avoid buying a gaming-focused model purely for peak performance without checking its camera consistency.