If you are buying a tool, the dewalt is probably cheaper than a dremel. If you arlready own a dremel and want to try it, perfect, you will move up eventually.
I completely understand the noise issue, but you will have to have a shop vac running when cutting wood so use that as your baseline. My vac is by far the loudest thing. If you have a quiet vac you can get a 300-600W spindle, those are very quiet, but cost a lot more, and some are of questionable build quality (I Still want to try one)