The first one is a kind a refreshed ISO with newer packages than the original ISO from first Leap 15.6 release some years ago. The number is a build tag to be able to distinguish the different builds.
The second ISO always points to the latest refreshed ISO and utilizes a shorter name to be more digestible for the users. So you can use the ISO with the short name.
The 5531 according to that URL provides Intel + NVidia hybrid/dual graphics, which seems to mean for numerous users software maintenance headaches that single AMD or Intel GPU laptop users don’t experience.
What other laptop - In the same class as the Dell Latitude - would you recommend?
Is there a site where this can be looked up?
Are AMD and Intel graphic cards ok?
Well, to reiterate, my choice of “no NVIDIA hardware” is a personal decision. As a retired software engineer of over 30+ years, I prefer using components that require less attention. (and we don’t need hard-core hardware).
Keep in mind, some folks might respond that they prefer NVIDIA - much of this is personal opinion.
As far as “other” laptops on-par with Dell, I can’t provide many clues. I would simpy research the specs I prefer.
And, “are AMD and Intel graphic cards ok?” … our two (hand-built) desktops are all AMD-based - same for the three laptops. No issues or special attention for hardware configuration / support with openSUSE, in use for years.