How important is it to create models in 3ds max or blender

The infographic is pretty old now but gives you an idea of the software format requests: 23% 3dsmax, 18% obj, 12% fbx, 9% 3ds, 7% c4d, 4% stl, 3% lw.
https://img-new.cgtrader.com/uploads/blog/04db7daa-a47d-4188-bfdc-ae17e3ce0a89.png

In regards to modelling accuracy/size the software doesn't matter, only thing that matters is you model it correctly to the specification/dimensions. If your exports are not coming out to the correct scale that is a user error.

You have to ask where your models will be used the most. If you're targeting archviz, or gamedev audience, then engineering software is not the best choice to create the models, because those people needs polygonal models with good topology and clean UVs and AFAIK CAD programs are not very good at this. Your models are published with almost zero relevant information for aforementioned audience. If i would be a buyer, i wouldn't give second look to your models. Think about that.