your both right. hows that for passing the buck?
really though it just depends on the trailer. a bad bumper pull will make you cuss. usually the tow bars will cure it, but i once pulled a small one with my dually for a friend that was dangerous. he sold it.
other suble differances- the bumper pull will track the truck and the 5th will cut you short in a turn in town, but it backs somewhat easier. to back one the front of the truck has to swing a long way to make the turns, not so with a bumper, it needs more room for the back of the trailer to turn.

if the bed is over the truck in the gooseneck, it will allow for a shorter trailer with the same interior facilities. hook up is a little hassle for the bumper type but the bed of the truck is open to use. sometimes the bed is needed to make up for the lack of space in the bumper. in short, it dont matter, they are just differant animals.

with both it is important to get a tow vehicle that is capable. you would not believe the overloaded vehicles that are on the road. dont look at the tag and think that is the weight, weigh it. really weigh it, loaded, and then check your tires to see if they are rated to carry that much wt.