I would probably do both in the end (local builds and CI). I assume people who use CI also do local builds!
Since I’m just asking about building plugins for MOD, I assume I would only need to be targetting Linux. Maybe in the future I’ll have a need for a Windows target (in the context of the MOD ecosystem I’m not sure what that might be, but I guess I have more research/learning to do).
And I think I found more details about moddwarf-new target in this forum post:
(Chances to migrate to C++20 compatible compiler in mod-plugin-builder - #2 by falkTX) which I think means it’s preferred (instead of moddwarf target). I’ve interpreted this as meaning moddwarf should be ok to use but will migrate to same as moddwarf-new soon