I am building a Khorne Zerker army for my new project and I was wondering, what heavy support option would compliment them best? A defiler with its long reaching battle cannon, base demonic possession, and multiple weapon configurations allowing for up to six attacks on the charge (pretty Khorny huh?). With out doubt it will draw incoming fire like none other giving my assault squads much needed time to get into assault. Taken in pairs and placed in cover behind my lines of berzerkers, their low ballistics skill and relatively moderate armor value are enhanced by redundancy of two battle cannons and survivability from cover saves. In an army where points are precious currency and lack of anti-tank sorely lacking, the simple thought of three-hundred points base firing at a squad of paladins or thunder hammer, storm shield terminators only to see it drift off or watch them save is not a pleasant thought. In a time of teleporting dreadknights, melta and powerfists galore, and razor spam; the size and speed make the defiler more like a risk that will either pay dividends or fail horribly (although I guess that applies for any unit in the game). A vindicator seems an almost perfect fit.
Armed with a high strength and low armor penetration value cannon and at a reasonable points cost, the vindicator comes in swinging for the win. Wait a second, a twenty-four inch range? Not to mention the vindicator needs to be placed out of sight so that it can work, meaning my assault squad's rhinos are drawing fire. If I do place my vindicators in the open demonic possession seems almost a must have upping the unit's survivability and still allowing them to fire but hiking up the price to that of the defiler. Then there is the phsycological factor that the demolisher cannon provides and you can't put a price on that, potentially using the vindicator to herd your opponent to the slaughter (not saying it will happen every time but here's to hoping).
I know I am comparing apples to oranges here but some feedback would be great as I have never used a defiler or vindi before.