I have both hand and drum....
The hand held belt sander comes in several flavors... 3" wide and 4" wide and there may even be a 2" wide. Same for drum sanders, mine are a 12" Baby Grizzly and a 24" dual drum General Industries, one of the best.
Here's what I do know, the hand held has a learning curve that takes about a month or two of serious use. I've used one for years and it still takes a "break in" period to get it right without making strips or gouging. The drum sanders are finicky about depth of cut. Too much, and it will stall and sand a trench across the work. Too little, and it doesn't seem like it's doing anything, so there's a happy medium.
I don't know anything about the cantilevered style Jets which is what you posted. Anything cantilevered just doesn't seem right to me, but they may work perfectly fine ... I donno? The 16" width would be great for cutting boards, so maybe it's a good choice.
Probably best to get first hand advice or at least read the reviews in the woodworking mags or Amazon.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)