If you do good 3d, thin you do good 3d. It doesn’t matter much about the app. All the main 3d apps are just tools. They all have the basic tools also. It should not be a problem. Now how fast you can figure out that color in maya = diffuse in max. (<bad example) That is a personal thing. But I don't think it would take anyone long going from one app to the other since they already know how to use a 3d app in general.