Amapi is great for modeling, but version 4 is very difficult to get to obj format. Version 6 can export directly. I'm not familiar with Strata 3D -- if you are comfortable with it and it exports obj, use it. If you're up to editing CR2s, I just use word, save as text only and drop it right on macconverter. Works like a charm! Any problems you encounter are more than made up for by the platform's ease of use.