Queen's Gambit Declined


Your question doesn't sound as well-formulated. How is black supposed to respond to its own choice to decline Queen's gambit ?!?

Sorry, I meant to ask what the "best" or most favorable way to decline the Gambit is
All right. Personally, I guess that Slav / Semi-Slav / Triangulated Slav are comparable by their "goodness". U can also play the Ragozin defense:

they are about equal, all three are excellent. the main difference is that the Semi Slav consists of many extremely sharp, long theoretical variations (Botvinnik variation for example), which is hardly the case in the QGD.