If anything, Tails is probably more secure. We know Liberte doesn't work with obfsproxy bridges by default. Does it do stream isolation? Does it scramble RAM on shut down? Does it have any security vulnerabilities? Tails is officially supported by the Tor Project and has a lot more users, a lot more people auditing it, and gets regular updates. Last point release for Tails was 12 days ago. Last release of Liberte was in September.