The s/t debut is the definitive one. Under 30 minutes long, not a second out of place, and really catchy and angry.
II pushes the debut to more of an extreme. Some of it is REALLY good (The Swimmer and I.O.U. in particular), some of it can be a bit harsh and ear destroying.
Strange Peace is most like the new album in that there’s more variety, but it’s overall faster and more explosive.
You really can’t go wrong with any though.