Yes, you are right. I looked only at the main specifications table here:
https://www.st.com/content/st_com/en/stm32-mcu-product-selector.html
For some odd reason these tables are not complete. But when you look into the detailed description, you find more.
I did also look a bit on the STM32Hxxx processors with the Nucleo boards. I did not find the H747 processor among them. I did find H563, H723, H753, H755, H7A3, H7S3. However I did not see any other better analog performance.
Thank you for the heads up about the Arduino Giga.