EditDroid and TR47 are transfers from the laserdisc editions (I think both are from the 1993 laserdisc edition, but that could be wrong). In either case, they represent the transfers of the best available ORIGINAL versions that were released to the theaters (there are some fairly small changes, nothing major).
OCPMovie, however, did something very different. He used the official 2004 DVD releases for most of his footage, since--despite our (and I include myself in this) complaints--about 90 percent (according to him) of the DVD footage had no additional effects added, either for the 1997-98 Special Edition release or for the DVD release. Then he used Moth3r's PAL transfer--which is like EditDroid and TR47--from the laserdisc for those scenes where changes were made.
Each has strengths and weaknesses: OCPMovie has a better picture quality for much of the film, of course, but (a) there are transitions between the official DVDs and the laserdisc transfers (although they are handled VERY smoothly) and (b) I think--but could be wrong--that there are SOME very, very minor changes from the original editions that made it through (which is understandable, given how Lucas handled it). [Because the biggest change, IIRC, is the Lapti Nek scene in Jabba's palace, there is a menu option to skip it entirely!]
The EditDroid and TR47 versions are not quite as clear, for obvious reasons, but laserdisc transfers are as close as you'll come to getting the original versions of the film.
Neither the transitions in OCPMovie's version nor the quality of the transfers has ever interfered with my enjoyment of the films, so take that for what it's worth.
In other words: Use that bandwidth. Get 'em all. All three of these are really, really amazing pieces of work.