pretty sure that they only have a few differences in construction
fit is the same (99 mm last?)
hot dogger has pro liners which are more durable, dropkicks have the cheaper liners
hot doggers have aluminum buckles (correct me if i'm wrong, thats just what they say on the site), dropkicks have plastic ones
flex is different, but you can just buy a new tongue if you want a different flex
other than that they are pretty much the same. i have tried on both, went with the dropkicks, and i love them.