Project Diablo 2 is a pretty vanilla version of Diablo 2 LoD. Yes, it rebalances.skills and items, and adds corruptions and endgame maps, but there’s no new skills. For a complete overhaul, you want MedianXL.

That said, I’d still forego both and go with D2R. Modding is coming along, finally. After a regular playthrough or eighteen (6 classes × 3 difficulties), give Diablo 2 ReModded a try.