If you are looking at downloadable versions (meaning no cost) I strongly suggest you don't limit yourself to one edition.
Get an urtext.
Get MANY edited copies for reference.
I personally have a Buonamici edition of the full set on my shelf which has proved to be VERY useful. Its hard to find though these days I believe, though his teacher's (Bülow) is around if you are willing to buy it (imslp doesnt have it for the tempest). If you know your history you may know Bülow was student of Liszt, who was a student of Czerny who was a student of Beethoven.. So arguably there is some good insights in there.
Arrau's edition would be in the same category, he also has a fairly direct teaching lineage back to beethoven..
Arrau, Krause, Liszt, Czerny, Beethoven.
would rather like to get a copy of it myself to compare..