I had Dominant strings on this fiddle for about 2 months and then decided I'd give the Obligatos a try. (E strings aside, since I have a Kaplan wound E string) To tell you the truth I couldn't tell all that much difference. Listening to the same piece under the ear and recorded with both Dominant and Obligato, it was not as big a difference as I expected. The Obligatos had a bit more ring, but then they were brand new as opposed to the Dominants which probably had 40-60 hours of playing time on them. I think I put out a bit more volume with the Obligato strings, but tone-wise they really didn't seem that different, except that I think I may like the Obligato G string bit better. 

They are both great sounding strings though and I wouldn't think you'll be disappointed with either of them. You'll have to decide for yourself which one sounds better, because they'll sound different on every fiddle you put them on.