Buyers should prioritize the Processor (SoC) and RAM to ensure smooth emulation or native gameplay. For retro-style handhelds, look for quad-core ARM processors or better; for high-end PC-handhelds, AMD Ryzen or Intel Core series are standard. The Screen Quality is critical—insist on IPS or OLED panels with at least 300 nits brightness and a resolution suitable for the aspect ratio (e.g., 4:3 for retro, 16:9 for modern). Additionally, verify Battery Capacity (mAh), aiming for at least 4-6 hours of continuous play time under load.