Personally, I went with Barneys Farm. However, I gotta admit I simply bought it due to my curiosity regarding Fem seeds. I got Whiteberry and Barneys Blue Cheese fems. Mine was based on nothing more than a click of the mouse and the name "Blue Cheese".
I popped it a couple of weeks ago and she is about 4 inches tall. Seems to be growing a bit slow but I believe that is strain dependant more than weak genetics. Anyway, so far so good with Barneys but based on the fact I have less than 3 weeks experience with it, I would take that with a grain of salt.
Good luck.