Is version 24.10.6 more stable and performant than version 25.12.2? Has anyone else had the same experience?
What same experience?
Are you asking or telling us?
What device?
I think if I could speak English, I could get through this forum.
The old versions seemed more stable to me than the new versions
Old versions are just old and fading out of security support. There is no rule of thumb what's more stable or faster, age doesn't magically make anything 'more stable' - and given the security implications, it doesn't really matter either, as a device must run the current version (well enough) or be replaced with one that does.
If you notice a regression on your device, debug- and report it, that's the only hope for getting it fixed - just sticking to an insecure obsolete version is never an option.