Learn German In Your Car

Hi!
Today I bought learn German in your car Cd's.
They were 9 Cd's and were in Track Format.
The quality was not bad but teaching ......
I dont know which one is better.
Pimsleur or living language or etc.
There are a lot of them trying to teach you a language in an Audio System.
I use Rosetta Stone and Tell me more Cd's .
They were both great but about Audio ones i think it need really a lot of time to learn that language.