Generator, always generator. I've been running Hybrid for a while and there is no comparison. The pure survivability that you get more then makes up for any amount of boost in stats that the focus may give. The longer you live, the more damage you do and the better of an effective tank you are. Dark ward is amazing, use it love it and be pleased with it. Only time i'd ever use focus is if I went madness. MAYBE deception but its been a while to remember all the testing I did.