Last season I tried 10 varieties of jalapeno:
Billy Biker
Full Pack
Gigante
Goliath
Grande
Jumbo
Mammoth
Pepper Joe's
Purple
Tajin
Of all of these Tajin from reimers seeds was by far the most impressive in terms of flavor, aesthetics, vigor, disease resistance, and productivity. They were not only the most impressive jalapeno, but the most impressive pepper plants period in a field of over 60 varieties. Thee only downside is that its an F1 hybrid.
Purple Jalapeno from territorial seed co is another one of the bunch that I will be growing again (this time from refining fire seed stock)... although it wasnt extremely productive, the peppers taste great, and the plants themselves are beautiful.
This season I will be trialing farmers jalapeno and "cracked" jalapeno from pepper lover in addition to purple jalapeno and alot of tajin.
For me no pepper can beat the taste of a nice crispy, corked, red, ripe jalapeno.