AoA.

Last year i applied 4 computer operator(SPS-4) in NDC. After written test, typing test and interview. I finally selected and my inquires started in September, 2011 meanwhile in February, 2012 I received letter from AWC for the test of Junior Assistant(SPS-4). After written test and interview, I selected for that post too. Now my both inquires are in process at the same time. I'm confused which organization should I join, NDC or AWC? Any suggestion?