Frédéric Chopin: Waltzes

Title	Key	Published	Type	Level
Waltz - op 18	E-flat Major	1832	Piece	8
Waltz - op 34 no 1	A-flat Major	1835	Piece	8
Waltz - op 34 no 2	A Minor	1834	Piece	6
Waltz - op 34 no 3	F Major	1838	Piece	7
Waltz - op 42	A-flat Major	1840	Piece	7
Waltz - op 64 no 1	D-flat Major	1847	Piece	7
Waltz - op 64 no 2	C-sharp Minor	1847	Piece	7
Waltz - op 64 no 3	A-flat Major	1847	Piece	6
Waltz - op 69 no 1	A-flat Major	1835	Piece	6
Waltz - op 69 no 2	B Minor	1829	Piece	6
Waltz - op 70 no 1	G-flat Major	1832	Piece	8
Waltz - op 70 no 2	F Minor	1842	Piece	7
Waltz - op 70 no 3	D-flat Major	1829	Piece	8
Waltz opus posth.	E Minor	1829	Piece	7

Repertoire: Chopin Waltz No.3, Grande Valse Brilliente, 'Minute' Waltz, Op.64 No.2, Op69 No1 by ihatepop
Sorry for the long threads title. I just wanted to ask that between the above waltzes, which is the most famous, which is the most worth learning and which is the hardest/simplest. I would be most obliged if you don't mention any stupid comments about hardest/simplest. ihatepop
Repertoire: Chopin's Waltz by sevten
In your opinion, what would you say is Chopin's most difficult Waltz?
Repertoire: Chopin Favorites by sevten
What is your favorite Ballade? Favorite Nocturne? Favorite Mazurka? Favorite Waltz? Keep in mind that they all have to be Chopin pieces. Try to answer as many of them as you can. Thank you!