While I understand and can appreciate the functional advantage of double triggers as many hard core purists so often are quick to put forward as reason to dump on SST's, in this situation the OP presents I would have to be of the opinion that a SST is advantageous over the double trigger. Ruffs are all that I have been hunting for the last 20 seasons and fully 99 % of flushes are going away from me.
I think that with the SST or for that matter, a SNST, a second shot can be had quicker enough than a traditional double trigger setup to possibly connect before the Ruff is lost to sight in the trees and brush.
Even in the example usually made that the double trigger shines in so-called instant choke selection, it is only so in that the tighter choked bbl can be selected first vs. the SST because it is usually set in the open bbl first to fire. If the bird was seen to flush from afar and coming toward the shooter, most SST,s have the time to shift to tight bbl first and automatically have the open bbl for a closer shot. If the bird is seen to flush from afar and going away, then the only advantage the double trigger would have is to be able to fire it's tighter bbl and have no reasonable second shot with the more open bbl fired secondly. The SST would at least have it's tighter bbl fired secondly as the range
Increased.
All the above is just this one man's opinion. Truly I love doubles be they of O/U or SxS and happily use either with SST's, double, and would love to get my hands on an old Browning Superposed with the twin single trigger!!!