I used the Supersoft as my winter ball (Truvis during summer) until W/S brought out the Duo Soft in the matte colors. I liked the look of the matte green and found that the Duo Soft seemed to perform a bit better on the greens than the Supersoft.
It might be a placebo, but the matte finished Duo Soft seems to check a bit better than comparable regular finished golf balls.
I prefer the Wilson Duo Soft to the Supersoft. Also last week I revisited the Callaway ERC and played a round with it, still prefer the Wilson over that too, but boy to I really like the triple track lines.
You really can't go wrong with either, I just prefer the feel off the putter with the Wilson's more than the supersoft.
That said, I am playing the Maxfli Tour's now and for the rest of the year.
I find these two to be very, very close. I think I've finally settled on the Staff Duo for the reason many have cited here: I have a better short game when I use the Duo. However, I have an inventory of Supersofts and I will probably use them up, mostly as my go-to ball for sim league.
Of the 2 in the original post, I prefer the Wilson.
For Fathers day recently however, I got some DX3 (Duo) SoftSpin, and I prefer it better than both of the above with a very similar feel. Virtually no price difference over here between all 3 balls, and I see a lot more spin on mid/short stuff on the DX3 compared to DX2 / Supersoft, despite it not being the urethane version.