[Cpoll]

The PSP SotN was different enough than the NA PSX release, including a new Maria mode (different than the Saturn one), and a new translation (technically better, but retranslates some iconic lines).

[entropicdrifter]

Perhaps most notably, the "What is a man?" scene was completely retranslated

[cholantesh]

I guess if you have/had a PSP this isn't an option but they did release a collection for the PS4 called Requiem that has these changes packed in.