Hi Heather. Which certifications that an employer accepts is really employer-specific. I’ve seen job openings where the employer specifically seeks out trainers with an AFAA certification and others that don’t. Here’s an idea, go to AFAA’s website and take a look at their Job Openings section and see which employers are there looking for trainers.
I got my initial certification through AFAA back in 1993. But since then, have pursued others (e.g. my CSCS, USAW and others) to supplement those credentials.
I hope that this helps/