It's hard to compare the two without a lot of details which probably aren't provided anywhere and even if they were, would take a lot of time and technical knowledge to break down. With that said, it's not true with modern SMT designs that greater SMT gains means more waste in the pipeline, that hasn't been a hard truth in quite a while. SMT is part of the design now from the onset. What we can say is true is that AMD's SMT implementation on average provides more of an uplift in well threaded applications than intel's does. This is easy to show and has been shown. You still have to take the overall performance into account, but that doesn't prevent the prior sentence from being any less true.It is not superior, To say it is superior is to imply Intel's implementation is not efficient; which is to say, don't talk about SMT in a vacuum.