The most obvious difference between '09 and '10 vintages in the Mosel was the quantity, which was down 35% in 2010.  This results in higher wine prices.

Quality difference was the higher acidity levels in 2010 making them seem drier and more austere.

2010 shows great minerality and characteristics of each vineyard.

2009 has more ripeness and fruity aromas.  2009 also has a unique creaminess on the mid-palate with good density, making it a special vintage that will hold together over the years.  The softness of the '09 was beneficial for the Mosel trocken wines, while 2010 is more tight and will take time to open up. 

The 2010 is is an ideal wine for the Mosel Riesling lover, like myself!  2010 challenged the winemaker with its outstanding acidity and greater presence of botrytis, which make exceptional higher pradikat wines like Spatelese and Auslese. 2009 was the year of the Spatelese.  2010 made the perfect Kabinett.                                                                   

Great Auslese Rieslings were made in both vintages in the Mosel. Bottom line: choose the vintage and style that fits your taste.  I love both vintages!

Marie, Wine Supervisor West/North West Coast