When comparing TrueCrypt vs BitLocker, the Slant community recommends BitLocker for most people. In the question“What are the best file encryption tools?” BitLocker is ranked 12th while TrueCrypt is ranked 20th. The most important reason people chose BitLocker is:
It offers the best integration, ease of use and support with Ultimate and Enterprise editions of Microsoft's Windows Vista and Windows 7, and with the Pro and Enterprise editions of Windows 8.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Can encrypt entire disks
Other than volumes and folders, TrueCrypt can encrypt whole disks too, including the system disk.
Pro Native Windows support
It offers the best integration, ease of use and support with Ultimate and Enterprise editions of Microsoft's Windows Vista and Windows 7, and with the Pro and Enterprise editions of Windows 8.
Pro Volume-based encryption
BitLocker allows encrypting an entire volume including the OS.
Pro Multiple authentication methods
You can use a combination of methods consisting of Trusted Platform Module, PIN, and a passphrase on a USB thumb stick.
Cons
Con Abandoned
As of May 28th, TrueCrypt is abandonware. The website warns that using the software might not be secure and suggests moving to BitLocker. The source code is available and there are rumors of an official fork.
Con Proprietary
No public audits possible.
Microsoft could want or be legally required to puts backdoors without users knowledge.