True and although I think AMD is currently more secure, they were also less prone to focus since they've less market. This might change, I hope they can still be as secure as this would give them a great argument but right now... it's worth mention but nothing more. We shall see in 1 or 2 years if AMD can keep their momentum.
AMD's current offerings are more secure as far as anyone knows. However, it may be one of those "security through obscurity" things. More effort and research has been done regarding attacks for Intel processor based systems due to their prevalence in the server market.