Chopin's music is monophonic. It is not really all that different from playing popular music. You have the tune and the chord progression. It's easier for you, and your average audience will enjoy it more, because it's easier for them to relate to. Yeah there's a lot of notes, but by and large the acheivement and feat is a physical one, or one that is acheived through physical acts. The Chopin Etudes are extraordinary pieces, by no means are they spewage, like many etude type pieces by other composers. BUT it is still primarily a physical stunt. Playing the Bach WTC, one book or the other or both is a mental feat, even with a page turner, as ILX has cleverly pointed out. And if the WTC recital were the easier accomplishment, we would hear that more. I have been to three different complete Chopin Etudes recitals by three different pianists (Youri Egorov, Christopher O'Riley, Juana Zayas) but have as yet, as BA points out, to have the oppurtunity to attend a complete WTC recital, of either book let alone both. And for anyone to dismiss the technical challenge of Bach; well you know what you said. Now you have some Karma repair to do.
It is the difference between Patton and Rommel (master tacticians, = chopin etudes) and Alexander and Napoleon (master strategists AND tacticians, = bach WTC), to borrow a similar example from military history.