Certification: ISSA or NASM?

I am weighing the certifications available and would like some input. Which would be better? ISSA or NASM? Or should I just get both?

Pick one–even pick one using “eeny-meeny-miney-mo”–just to have A certification. After that it’s up to educating yourself and producing results.

Thanks. I’m finding that the actual cert doesn’t matter like you said. I’ve been doing this for about 3 years non certified but want the cert to be official.