It is hard for me to compare the ContiProContact with the Conti ExtremeContact DWS, since they are on very different vehicles, and also because the DWS's are lower profile (40 series).
So far, the DWS's on my Volvo C70 have been very quiet, compared to the Pirelli PZero Rosso's they replaced. Perhaps the DWS's will grow noisier as they wear, but so far so good. (But the ContiProContacts on my Outback are also very quiet.)
I'm not sure what to make of the "soft sidewall" comments from some reviewers. It probably depends on what prior tire the DWS was being compared to. Since many DWS applications are for fairly high-performance cars, the "standard" they are being compared to are other high performance tires, many of which are pretty stiff (in some cases, the prior tire was a run-flat, which will definitely have a stiff sidewall...).
The DWS's give up a bit of ultimate dry handling, I think, in favor of really good wet and snow performance, and also in favor of a good ride. But this is in the context of very high performance tires. Compared to more normal "touring" tires, like the ContiProContact, I would think that the DWS will outhandle them, whether in the dry, or wet, and MIGHT even be better in snow. They will also wear a bit faster.
It may be a moot point - I don't think the DWS's come in the right size for a 2010 Outback, unless you are also doing a "plus-size" wheel change.
I have been reasonably happy with my ContiProContacts so far, although that includes almost no time in the snow (so far). Bottom line - it's a tough comparison when the tires are so different in intent, and are usually used on very different cars.