exsim or transcender best?

I actually have both, but I've been putting all my time in on the sybex book and the transcender exams and i'm about 90% success rate on those combined tests. But, I haven't even touched my exsims yet, I've done the netsim labs, but none of the practice tests. Are the exims better than the transcenders, should I be putting more focus on those exams?