>>936233947 (OP)this is the superior method...
all others fall short..
with that being said, boiled is a far superior method to the others.
grilled, griddled, and deep fried have oil, carbon, grease, or fat residues.....
microwaved leaves an ionized taste and once the dog cools it is unrecognizable and/or the fat congeals it to a gelatinous stick...
air fried is probably the next best method (behind boiling) but is the most inefficient means of cooking a hotdog as the precise repeatability is almost non-existent in almost all cooking scenarios...
i also noticed you don't have toaster oven, which is superior to the air fried method and subordinate to boiling...