The WC is a cool white and the 5a is a warm white. The Q5 will be brighter than the Q2 but the latter has a warmer colour which some people prefer outside. Also, some people have reported that the 1SD module is brighter than the 3SD. I have the latter in a Q5 and have been very satisfied with the output on high but the PWM flicker on the lower modes is so bad that I don't bother with them.
Essentially, just pick the module that suits your use and power source and I wouldn't worry too much about the exact amount of light coming out, it will be bright and narrow.
Andrew