Tcs or NSN

hi to all, as i mentioned alreadyi'm placed in tcs. now i got new opportunity in NSN(Nokia Siemens Networks) really don't know which one choose. in Tcs i'm getting good packege but joining is late. I'm getting joining in Nsn very soon but salary is half of tcs and also on Off Role. Please tell me what to to do where to join. Which one is better.