Looking To Get An XXX-T

My XXX-T is only a few months old and has had a Novak 5.5 in it since the second day I owned it. Mine started out as the RTR Sport version. The Matt Francis 2 only comes in kit for an is entirely graphite. I have heard that graphite is stiffer but will break easier than the RTR plastic parts. I have not had any trouble with my diff yet, I check/tighten it after every couple of runs. I also have an E-Maxx and still run the brushed Titans. I am choosing to mod the Losi because it is cheaper to fix when I break it.