The first third-party gaming handheld with SteamOS, the Legion Go S, is now available for pre-order.The Legion Go S offers the freedom to choose between Windows and SteamOS, with pricing starting at $550.The SteamOS version is more affordable, with 16GB RAM and 512GB storage compared to the Windows version.The SteamOS model of the Legion Go S provides a more pleasant and efficient gaming experience, making it an attractive option.