BMW has an extensive lineup of SUV models for you to choose from– one of the broadest in the automotive industry, actually. There are several different sizes for you to choose from, as well as other variables within each category including powertrains and equipment levels. When it comes to overall performance, though, some of the fastest conventional vehicles fall into this automotive line. Focusing on BMW’s SUVs, particularly the X3 M and X5 M, which of the two models is for