Smartphone or tablet? Choose Android if it's a Samsung, Google Pixel, Xiaomi, or similar device. Choose iPhone or iPad if it's an Apple device without a keyboard.
Computer? Choose Mac if it's an Apple computer running macOS. Choose Windows PC for all other computers (Lenovo, HP, Dell, Asus, custom builds).
Multiple devices? Start with the device you're most concerned about right now. For an organization or family, there are dedicated paths — use "Restart App Finder" and then "Permanently erase data," or use the Business Finder.