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On Word 2016 for Mac, it won't matter which format you use. If you choose to save as DOC and it's a new document, go ahead and save the blank document before continuing. Chances are, these differences between DOC and DOCX won't affect you, so saving as DOC shouldn't be a problem. Still, Word users have been using DOC for years and for the most part it's worked out really well. The biggest advantages are probably SmartArt and the fact that a DOCX is more stable and less susceptible to corruption than a DOC file. If you're not aware of the differences between the 2 file formats, you should understand that although in this case we're recommending saving as DOC, there are normally advantages to saving as DOCX.
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The best way to enable the grouping of MathType objects with Word drawing objects is to save the Word document as a DOC file instead of the default DOCX.
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