A theatrical Episode II as we know it does not exist, so just rely on the HDTV version since it’s the closest thing.
Episode III only has one “change” in the form of that infamous wipe transition, so either the DVD/HDTV (does not have the wipe) or Blu-ray version (does) will do for watching it just to watch it. Schorman is working on a “theatrical” version of it, but I’m not really sure how different or unique it will be from official releases besides the wipe.
Maybe a dumb question, but what is the difference between the DVD and HDTV version?