I think Deng has the potential to be better than Iguodala, but his injuries last year are more worrisome, assuming 100% healthy I'd give a slight edge long term to Luol Deng, and I see a bigger edge to gordon, hence why i picked deng gordon, i personally think all things being equal deng/gordon are better.
Course, for the sixers, deng gordon doesn't work as well cause of thaddeus young...