Is wiener Urtext good?
Urtext editions, in particular those produced by established publishers of such musical scores such as Henle, Wiener and Barenreiter, tend to be high-quality publications, with detailed and insightful prefaces and notes, descriptions of sources (usually in German, English and French), useful fingerings, and ...
Is Henle good for Chopin?
Henle is problematic for Chopin. They're based (if I remember correctly) on the original German editions, which aren't as widely accepted. The newer Padrewski editions are supposed to be better than the old ones, but I haven't really had a chance to compare them.
Are Henle books good?
Henle not always the best. It is good for Handel, Beethoven, Schubert, and ok for Chopin, Schumann, and some others. Best for Haydn - Wiener Urtext (Landon).
Is Schirmer Urtext?
Urtext is not a publisher, it is an editing philosophy. Schirmer, in fact, publishes some urtext editions. For most music, such as the Chopin Etudes, there are a number of sources that could be used to come up with some sort of consensus view of what the music was as written by Chopin.