When evaluating gas-powered sweepers, prioritize the engine displacement (typically 150cc to 250cc) and engine brand (e.g., Loncin, Zongshen, or Honda) to ensure long-term reliability. Pay close attention to the sweeping width, which usually ranges from 600mm to 1000mm, as this directly impacts cleaning efficiency. Additionally, verify the brush material; high-density nylon or steel wire mixtures are essential for durability against abrasive surfaces. For walk-behind models, ensure the unit features multi-speed transmission (forward and reverse) to handle different terrains and debris densities effectively.