Inside the research
Different systems, different shelves
Only three of eight unbranded prompts shared any brand between the two systems. In this sample, a single prompt or platform would have given an incomplete view of brand visibility.
Brand presence and source presence are separate
tentree appeared in eight of the sixteen unbranded answers. The report also recorded different linking patterns: Google AI Mode returned more distinct source links, while ChatGPT linked more heavily to brand websites.
What I would investigate next
Repeat the prompts over time, separate recommendations from incidental mentions, and compare product attributes with the sources attached to each answer. These observations suggest questions for testing; they do not establish ranking factors.