My impression from playing both was that Fallout 3 and Fallout: New Vegas were pretty solid when you started playing a game
well, okay, if you get the post-release patches in place
but that the game became less-stable over the course of a run.
The loading times also got a lot more painful over the course of a run. Fallout 76 and Starfield did much better in that respect.

Starfield was very stable for me.
Fallout: New Vegas was unstable, especially near the end of a run. And I'd swear that it was worse on the XBox than on the PC. Not just longer load times, but plenty of times that the thing would die when loading an area.