NAV 4.0 Dev Certification is helpful

Hi all,

I am Nav developer.i didnot take any certification exams so far,i worked on Nav 4.0 but i donot know about Nav 2009.
is it going to be helpful for me if i take exams in Nav 4.0 Dev instead of Nav 2009 in future.

please awaiting for your response.

Thanks in advance,

SumaVinayak.