When purchasing wholesale, you must prioritize actuation force (measured in gf), pre-travel and total travel distance (mm), and lifespan (typically 50-100 million keystrokes). For high-end builds, verify if the switches are factory-lubed to reduce friction and whether they use 5-pin (PCB mount) or 3-pin (Plate mount) configurations to ensure compatibility with your target keyboards. Additionally, check the housing material (e.g., POM, PC, or Nylon) as it significantly impacts the sound profile and durability.