@bokane Right, it's hard to be sure because there's no public discussion on these issues. But from my own private conversations I get the impression that Deng tends to get credited with all the positive effects of his reforms, while Jiang has become the scapegoat for all its failures.
That's one of the weird things about 1989. Even people who know and care deeply about it rarely blame it on Deng, even though it was quite obviously his ultimate responsibility.