I really cant seem to like Lightning sorc no matter how hard i try..by favorite are fireball and blizz... Should i do a hybrid or make a full fire sorc with a killing merc ( for immune) or full blizz same goes for merc

cold sorc with reapers toll merc

blizzball hybrid does the job well, my favourite build as well. of you want to kill everything, go hybrid. if you are ok with skipping immunes/wait for your merc to kill them, then pure blizzard

my favorite spec:
ES Orb Sorc with Reapers Toll A2 Might Merc