Henle would also be more up to date and include all pieces for a certain genre. For example, Paderewski Chopin nocturnes are missing some Op.post. nocturnes including the C-sharp minor.
From a readabilty POV, I prefer the Paderewski to Henle - Henle's noteheads are huge black dots that are difficult to read (and this is all their editions). But Henle is printed on yellowish paper which is easy on the eyes and the newly printed Paderewski is on white paper which is not entirely opaque, either.
Price of Paderewski is very inexpensive compared to Henle which is 3 or 4 times as much.
Durabilty of the Paderewski may be better than Henle, which falls apart after extensive use. Henle's cover's paper wears very easily and the binding gets the most wear.
Alternative editions of Chopin's works can be found. Peter's Editions are in the process of publishing Urtext editions of his works. They currently have the Preludes published. The cover is laminated, the paper is yellowish, but the print is small.