You ask an interesting question that I don’t think any individual trainer can answer. I wonder if there have been any employability studies done by ACE, IDEA, NASM, IRHSA, etc.
There are many, many ways to be a good trainer. I’m sure those of us with training experience can think for just a short time and come up with examples of great trainers with college degrees and also great trainers with a training certification. And we can also think of trainers with degrees and extensive certifications who we wouldn’t hire in a million years.
In an ideal world, trainers would have a mix of education and experience. Neither a certification nor a degree is a perfect indicator of a person’s ability to interact with an actual client.