Bob, I use the drawbar on the 3-point hitch more than the swinging drawbar simply because I can lower it, but up to the trailer and raise the ball into the hitch. It also puts the trailer farther back so I can turn sharper without getting a wheel or the 3-point lift arms into the trailer. However, if I'm pulling a really heavy trailer, then I use the fixed swinging drawbar.
And I think, DFB, that you're mistaken about the front blade restricting air flow enough to cause any heating problem on a tractor. I certainly understand it with a truck, but the two machines are made for different use. Tractors normally operate at a slow enough speed that they are not designed to depend on their speed to put air through the front end like cars and trucks. And they quite normally operate pulling plows, trailers, etc. with front end loaders. For instance, it's quite common for me to see a tractor going full speed down the roads around here, pulling a trailer load of hay and a round bale on a hay spear on the front end at the same time.