Is the odt format inferior to docx?

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I don't know if there is such a better comparison.

Anyway, in your link I see a mixture of:

• DOCX vs ODT feature comparison;
• when you work on DOCX & MS Office, how the features will convert to ODT;
• Word vs Writer comparison;
• and some outdated (or incorrect) facts.

My feeling is that the comparison was made with MS Office in mind (not made from the LO point of view), so maybe it is not too useful, depending on what app you are using.

Examples:

• Content / Table of Figures (TOF) / Not Supported -> That fact is false, even OpenOffice could create "Illustration Indexes" on ODT
• File Operations / Fixed File Format / Supported (Can save to .pdf and .xps file types) -> That is about Word vs Writer, not about DOCX vs ODT
• Collaboration / Track Changes / Not Supported (When you save the Word 2007 document in .odt format, all changes are accepted) -> Not true, see for instance this thread.
• Content / Frames / Partially Supported (When you save the Word 2007 document in .odt format...) -> Well, that is about using Word 2007, not about what ODT can support.
• Formatting / Watermark / Not Supported -> See this blog post from 2007.

And so on...