As someone who's using both in one game, Arcane Heritage is ascension path dependant and has the unfortunate tendency to ♥♥♥♥ on the player if they mess up with it and hard. This one has mostly traits & civics, though there are other things as well. I think Manacite is from this mod? Either way, this one's easier to manage.

Manacite is from this mod, and this mod is more oriented at magic being a natural thing you encounter during all stages of the game, while Arcane Heritage is mod geared towards mid and late-game stuff.