Editions of Chopin works present the following problems:
1. First editions were published simultaneously in different countries. Many times there are differences between these editions and no way to decide which one is the correct one.
2. Chopin kept making alterations on the scores of his pupils.
3. Chopin kept modifying the pieces after he published them
4. Given the popularity of Chopin’s works, every publishing house has its own edition. Some good, some bad. The attitude of respect for the composer and trying to keep as close to the original text as possible is a recent one. Most editors before the 1930s modified the pieces by adding fingerings, dynamics and even notes.
Having said that, you should try to get an edition which has Chopin’s original fingerings, since they can be an invaluable clue to the sort of movement he expected you to execute when playing his etudes. Unfortunately Chopin’s fingerings are sparse, so if you want a heavily fingered edition with everything worked out for you, you will probably have to rely on an edition whose fingerings will most likely be different from Chopin’s.
The four most popular editions are Augener, Peters, Schirmers and Ricordi, I don’t like any of them very much.
Then there are the Cortot editions which are a must, even though he uses his own fingerings (at the time he published them Chopin’s fingerings were not widely known – but I doubt this would have stopped him from using his own fingerings).
Finally, the four best editions (in my opinion) are the Paderewsky, the Oxford edition (based on Jane Stirling’s manuscripts which were heavily corrected and added by Chopin himself), the Henle Urtext edition and the Vienna Urtext edition. The Vienna tends to be more comprehensive than the Henle since they used a much larger number of annotated scores (by Chopin) from his pupils, so I would say that if you are interested in the original Chopin fingerings, the Vienna edition is a better bet.
(These are the editions I am familiar with - there are others but I do not know about them).
I hope this helps,
Bernhard.