QUOTE(abennett @ Mar 31 2009, 04:25 PM)

Is it wrong just to play from a different edition to make it easier due to how the notes are layed out, and am I sort of cheating by doing this?
Certainly not!

In principle there's nothing whatsoever wrong with choosing what is most practical. The big problem is that it's rarely quite that simple.
It never ceases to amaze me that performers will quite happily spend an inordinate number of hours making sure they can play all the notes exactly as they appear on the page, while at the same time remaining totally unconcerned as to whether those printed notes themselves are correct. When you think about it, whether you play a wrong note accidentally or whether you play accurately a note that is printed wrongly in the score, the end result is the same: they are both wrong notes. Ultimately, what's the difference?
What constitutes the right notes can get to be quite controversial at times, especially where a composer has produced several different versions of a work, but, as a general rule, I would always advise seeking out an edition with reliable, up-to-date scholarship. You owe it to the composer. Unfortunately, older editions, especially those freely available on the internet, are often very seriously deficient in this respect and really ought to be avoided. Opting for an edition because of its helpful layout (page turns, distribution of the notes under the hands) is OK in my book; opting for an edition because some of the readings themselves are easier would be wrong-headed - unless of course those easier readings can be shown to be what the composer actually wrote.
By all means choose the most user-friendly edition, but my advice would always be to try to check and amend it against a modern, reliable, scholarly text. With Bach that would mean Bärenreiter's
Neue Bach-Ausgabe, or Beckmann's edition for Breitkopf. I don't know the old
Bach-Gesellschaft at all well, but, from what I have seen, some of the texts seem pretty good, others rather dodgy. You could probably amend them easily enough.