No I am not offended, I just find your opinion completely baseless. Delta Force is equal to the SAS in every respect. It is obvious you know nothing of the military in general as you are listing special forces and the question was military power. The SAS and Delta are a very small (and I do mean small) percentage of the overall armed forces of each their respected countries.
I also know you are referring to skill and efficiency - pfft... to leave the US out of the top 5 shows your ignorance toward military history in general.