Why SEO tools show different volumes for keywords?

I have analyzed the same keyword on 3 different very popular seo tools but they gave me very different results

For example:

- Semrush: 422K volume - Ahrefs: 673K volume - Moz: 180K volume

Chatgpt says that its because they dont have accurate data.

But like then which tool should I trust the most?

Because these metrics MATTER A LOT.