If you only have a 1500, then I would go with a dump truck.
In my situation, my first truck was an S-10 and had an old F-350 C&C dump truck. The dump did all my dirty work hauling a little over a ton of material and had a plow, so ultimately it was my plow truck.
Now I have an F-150, 10K equipment trailer and C3500HD dump. With the dump and trailer combo, I can haul my mini skid and a 3.25 ton load of material around when I need to. Nice to be able to haul the equipment and material at the same time.
The dump also is used to plow large commercial lots and a few driveways. On top of it, I can haul bulk salt with an under-tailgate salt spreader.
In all honesty though, I might get a dump trailer at some point. It's nice to do light work and just pull the trailer around with the F-150, but a pain to unload brush and debris by hand off the equipment trailer.
So, ultimately you have to decide what works best for your business model.