This used to be an easy answer, but now we have hybrid longbows and so much overlap that there can be recurve-like longbows and longbow-like recurves.
Generally, for a given draw weight, a longbow is lighter and more forgiving while a recurve is faster but more demanding of proper form. But I have a one-piece recurve that is lighter than a take-down recurve handled longbow, and long recurves that are pretty forgiving and stable. Then you get short longbows like the Shrew that have recurve speed without the curves.
It can boil down to which appeals to your eye.
I don't know Samick or Mad Dog except what I see in ads or websites . . . but personally I'd put my money on Mad Dog.