[RC-Monster Mike]

What is better is largely a matter of opinion. The pros use the small, light tires because they are so talented and competitive that a little extra weight or slightly less turning ability can cost 10nths of a second, and ultimately the race. These guys are at the top of their game. A less seasoned driver may actually do a lot better with the 40 series tires, as they add stability and traction. I find the 40 series easier to drive myself, but I tend to race the smaller tires like crimefighters myself. Bowties work on our track as well, but the crimefighters seem to be the tire at the moment(haven't tried the boas yet).