If you are running a modern PC, you likely need both. However, specifically for the , you are looking to run 64-bit software, which is the standard for most high-performance games and creative tools today.
You will often see two download options: and x64 . microsoft visual c++2019 redistributable package (x64)
You might look at your "Installed Apps" list and see a dozen different Visual C++ entries (2008, 2010, 2012, 2013, etc.). If you are running a modern PC, you likely need both