I planted a bunch of these seeds thinking not many would sprout. The result is I now have way too many plants, because most, if not all of them germinated. Though the plants from each seed have behaved fairly differently.
Results based off my limited experience:
Early - These have been odd. They started out the strongest. Right now some of them are blooming and producing peppers.
Joe's - I can't quite get these guys caught up to the others. Not many of the plants have grown much. One or two have been doing well, but for the most part my Joe's plants have been weaklings.
Black - These have been animals. My black jalapeno plants that have grown are currently producing the most peppers of the bunch. Also the purple flowers they produce are really pretty.