hebrew national are very good. no ifs, ands, or butts.
since kosher dogs cannot be made from meat including the sciatic nerve, herbrew national invented an add campaign to show that "no butts", or rear half of the cow, were used in their dogs.
i've heard that some kosher butchers remove the nerve, thus making butt portions kosher. but it's an uncommon practice in the u.s..
that being said, thumanns, boars head, and skinless sabretts are also good.
i will eat a griddled or grilled dog if forced, but i prefer boiled. grilling/griddling concentrates the saltiness too much, imo.
my all time favourite was from my high school girlfriend's dad's kosher butchery, abeles and heymann kosher provisions: Abeles & Heymann
i haven't had one in years, so i don't know if they're still the same.
my second faves are the hot smoky bison dogs from here: Hendricks Farms and Dairy - HF&D Philosophies
they're best when boiled, then the skin peeled off.