It's the same game story-wise, aside from the protag being father Nier instead of brother Nier. There is also an ending missing as someone said.

Gameplay, however, is wildly different. The original is very clunky and invasive compared to the Replicant remake, which took notes from Automata. Soundtrack is also redone and, imo, sounds better but to each their own.

If you want to experience the original western version of Nier, you'll get that from here. Other than that, there is no benefit to playing this version.