What's the sequens of difficulty with the Burgmüller etudes? Op.100, 109, 105 ?

[nodb]

Is Burgmüller opus 105 more difficult than opus 109?
What's the sequens?
Thanks

[stevebob]

Is Burgmüller opus 105 more difficult than opus 109?

Yes, at least according to the Wikipedia article about Burgmüller:

In his Op. 100 set of 25 studies he has charmed many people with pieces like La Candeur, La Chevalresque, L'Arabesque, and Ballade. More demanding are the 18 Characteristic Studies opus 109. Opus 109 contains the popular pieces Les Perles (The Pearls) and l'Orage (The Storm); even more demanding are the 12 pieces of opus 105.