I guess it would depend on the traction of the "cleared" side of the blade. If you're able to get to dry pavement than the dually would be better but swr will do better if the is still snow.
Simply put the swr will out perform I just driving through a gravel road with say 10" of new snow on it, everything else being equal.
So, now that I've decided to get a truck & plow for next year... and I tend to over think everthing LOL... what about something like this on a truck? Best of both worlds? Small contact patch on ice and hard packed and flotation when pileing snow...
Crap we didnt get a drop up in Truro...... I put a hyd angle blade on my front loader with a conveyor belt for an edge,, works great,,,doesnt dig up gravel ..