Although I agree that a fifth wheeler is a little nicer inside for full time living I will probably go with a bumper pull trailer myself when I retire in about another year. The reasons are:
1 - A bumper pull is cheaper for the same interior size - a fifth wheel is heavier, which means more pin weight, and so it needs more truck, which is more money, too.
2 - A bumper pull lets me store more things more securely in my truck bed.
3 - A fifth wheel is taller meaning more problems with trees and more wind resistance on the road.
4 - A bumper pull turns corners a little easier (I am told).
5 - A bumper pull doesn't fall on your truck if you make a big mistake hitching it up.