The choice follows your existing ecosystem, not a model leaderboard that changes every six months. Google suite, Gemini Enterprise. Microsoft suite, Copilot. With no strong preference, Claude and ChatGPT are a few months apart.
If European hosting or data sovereignty weighs on the decision, Mistral AI enters the comparison, with its enterprise offering and models deployable on your own infrastructure.
The non-negotiable point is the enterprise plan, Team or Enterprise depending on your size: it carries the organisation rules, retention and logging.
We resell no licence, so we have no interest in you buying one rather than another. What matters more: designing your assets to be portable. Skills in plain text and connectors on the Model Context Protocol standard travel. A configuration locked inside a vendor's interface does not.