It depends on the task. There is no single best AI for interior design. At Kingdom & Co., our team uses Claude (with client consent) to capture and document design meetings so no detail from a client conversation gets lost, ChatGPT for design questionnaires, intake summaries, project documentation, and image-generation prompts, and Gemini for research and comparison work. Most professional design firms use more than one tool because each one is stronger at different tasks. The mistake is picking a single AI and trying to make it do everything.