Hmm I would say the two most popular ski resorts are Garmisch (where the olympic games will hopefully take place again in 2018) and Oberstdorf/Kleinwalstertal. You can find the presentations of these resorts here:
www.skiresorts-test.com/skiing-holiday/garmisch-partenkirchen-classic-gebiet.html
www.skiresorts-test.com/skiing-holiday/kleinwalsertal.html

Just take a look at the resorts in Germany here on skiresorts-test.com. I am sure you will find your favorite resort.

Regards
Peter

I normally ski France, Austria, Italy, and I have family in Germany.

Please can anyone tell me which is the best resort for snowboarding, and nightlife!!