Unambiguously the best way to play these games. I didn't replay the games completely for this review, but from what I understand, you get voice acting and all of the DLCs (indie cameos included, unlike BMZ Steam). If I had to rank the games, it go:
Zero III (10/10)
Zero II (9.5/10)
Zero (8/10)
Overall, these games are incredible, and as you beat each one, they get better and better. Definitely worth the money.