CAD certification exam — which software does the test actually focus on?

I'm trying to figure out which CAD certification to pursue and I'm a little confused by how the landscape is structured. There seem to be software-specific certifications from Autodesk and SolidWorks and then more general CAD competency certifications that are platform-neutral. The job listings I've been looking at mention "CAD certification" without specifying which one, which doesn't help. I primarily work in AutoCAD and some Fusion 360 but I've touched SolidWorks briefly.

I'm a mechanical drafter with three years of experience in an engineering consulting firm. I can produce detailed drawings, do 2D layouts, and manage drawing sets, but my 3D modeling is less developed. The question is whether a general CAD certification would validate my skills in a meaningful way or if I should be pursuing the AutoCAD Professional certification specifically.

If you went through any CAD certification process, I'd genuinely want to know how employers responded. Was it something that came up in interviews or affected salary negotiations? I've been using a CAD practice test to assess where I am on general concepts, but I'm not sure if conceptual knowledge is what the market actually wants or if they want platform-specific proof.

My timeline is flexible — I'm not job-hunting right now, this is more of a professional development goal. So I could spend 12-16 weeks on this properly if the right credential would make a meaningful difference, or do a shorter sprint if the exam is accessible with my background.