I drive my dually as a daily driver. I don't have a need for one and the only reason I got one, is I like the looks of a dually. I don't tow heavy and have considered going to a 3/4 ton. My observations:
1. Empty a dually is a rough ride. Even with aftermarket shocks etc. You need weight in the rear.
2. If you ever have to drive on ice, forget about it... unless you have a lot of weight in rear.
3. Getting off wet boat ramps, see #1 and 2.
4. If your towing heavy or with livestock, I would definitely get a dually. More stable.
Don't get me wrong, I like my dually but if I get another truck either 3/4 or 1 ton, I will get a 4X4 as I think the above would not be a factor.
Steve