Used SYD rub., and really like it. I often make my own, but just as often buy them, and try them out. Recently got Black Ops brisket rub and was most pleased.
I would not smoke in a garage...What about this little pop up tent deals? Living in the Seattle area it rains all the time, and I have to use one often, and it works well!
Its seems to me that the Comp does not maintain a steady 250 nearly as long as a KBB...I never timed it, but the last few briskets I did were Kcomp, and it seemed to not last as long.