Not what you really want but you could look at the manufacturers sites and read their blurb behind their designs. If you look at the most expensive ones vs the budget ones you can see why the former might be better and the function of each aspect. For instance, good drills are double fluted with a high number of turns in the spiral for more efficient clearance and also sharper edges on the spiral so that the hole sides are cut cleaner, like a revolving chisel. The tungsten tip in good SDS bits often have a cross-shaped cutting edge so that the hole face is chipped finer and faster, which can lead to easier clearance. I like the Black and Decker Bullet tips for hammer drills, which have tips that are concave-pointed as opposed to straight-pointed, which is the norm. They seem to punch a hole better as opposed to just scraping a hole out and getting hot, like the conventional tips. I can do harder material with those bullet bits in a DIY battery hammer drill that I can't do with conventional bits... AND they can be used again and again! I don't know anything about tungsten quality, so that might matter as well.