for the record,
Etudes I've dabbled with either extensively or atleast more than just read through are..
Op 10, 1,2,3,4,5,6,8,9,12
Op 25, 1,2,6,7 10,11,12
...at this stage I'm satisfied with none of them.
Nocturnes I've mostly just read through a few times, which is largely a reflection of the fact that I found them a great deal easier than the etudes on average, I had to spend more time with etudes to get an idea of them..
No doubt I'll spend copious amounts of time on nocturnes sooner or later though when I endeavor to learn a few properly.