These exams are very different; you can't say that one is "better" than the other.
70-511 will test your ability to develop desktop applications (basically WPF) with Visual Studio 2010. It grants you a "Technology Specialist" certification. It is in the path to get the MCPD certification, which would require 3 additional exams.
70-483 tests your ability to write generic C# code, as well as using some Framework libraries such as Data Access or data validation. It is based on Visual Studio 2012, so it is newer than 70-511. It gives you a "C# Specialist" certification. It
is in the path to the MCSD certification (newer than MCPD) for Windows Store Apps (versus 70-511 which is devoted to WPF apps). The MCSD would require 2 additional exams after the 70-483.