I have not had good luck with Garlic. What variteies grow best in Zone 6 Oklahoma.
The majority of garlic will grow very well in zone 6 and colder. I have 13 different kinds including Lorz Italian, Inchelium red, Russian, Romanian and german red, Chesnok, Khabar and Music just to name a few.
I really like Chesnok since it's a very tough bulb that has a longer shelf life. My suggestion to you is visit www.gourmetgarlicgardens.com and get an education...Read the book "growing great garlic" it's another great resource.
Bloosquall Garlic Gardens