Ubuntu updates vs Fedora updates
(More stable updates vs more frequent updates)
Ubuntu
Ubuntu aims for more stability. This is more true for LTS releases like 24.04. In general Ubuntu does not update any essential components of the OS, like Gnome unless there is a critical bug or a security vulnerability that needs to be fixing.
This results in a system that may look a bit old in 6 months, but is very stable.
See Why don't the Ubuntu repositories have the latest versions of software?
More on Ubuntu kernel updates for short and long term releases: Where can I find out when the next kernel version will be released for my distro version?
Fedora
Fedora is the initial testing ground for what goes in (or does not) into Red Hat. This means every new update gets thrown into Fedora. Even though Fedora has a six month release cycle like Ubuntu, more parts of the OS gets updated within that cycle, such as the kernel, or in this case Gnome, in Fedora as compared with Ubuntu.
Hope this helps