Choose folder lock software when you need to protect selected folders and files without encrypting the whole system or drive. Choose BitLocker when full-disk encryption is the actual goal.
1. You want to protect selected folders instead of the entire drive.
2. You need hide mode, lock mode, or more direct folder-level control.
3. You want a more targeted privacy workflow for office files, client folders, or shared PCs.
You want Windows full-disk encryption for the whole system drive or a full removable drive rather than selected folder protection.