Hands down : Which is the best?

AV's heavily resist to-hit debuffing though. So I'd think /dark looses out there. For soloing AV/GM type enemies /poison is NASTY good. Heck, nox gas can actually proc it's hold on most EB and AV that I've seen. Assuming the pet survives long enough in melee. I've not tried soloing an AV with it, but ninja/poison was crazy good at handling elite boss versions of every AV I fought. Maybe not always effortless, but crazy good at it.

Don't forget demon summoning either. As others have mentioned, they are rather nice. Plenty of -resist debuffing going on. And one of the tier 2 pets gets a single target AND aoe heal. They are sturdy, with a good mix of damage types. Pair demons with thermal, and you have even harder to hurt demons. Pair it with FF and they can handle themselves just fine with only one hench for healing. Pair it with /poison and you get some spot healing with strong 'hard target' debuffing.

That, and the whip attacks are just plain fun.

/Dark's -tohit by itself "MAYBE" isn't enough against AV's, but /dark paired with necro is -tohit insanity. I have checked the in-game stats and I can keep perma -130% tohit on 1 target, -50% damage, -600% regen, -50% resist.

I can say with in-game experience that I can floor most av's tohit chance. Add in all 4 of the unique pet defense/resist io's, shadow fall and maneuvers and my zombies have around 18% defense to all last I checked on top of -130% tohit.

If you play necro/dark as a tankermind against av's it's pretty insane. With proper use of howling twilight and fearsome stare it's pretty stupid what kinds of scenario's a necro/dark can handle.

Basically with necro/dark and some built in defenses as long as you make first contact with the enemy you might as well have soft capped defense along the lines of a bots/traps. This includes av's.

/Poison has some very nasty debuffs, but I would take a well built and played necro/dark over literally any possible primary with /poison. In fact, I would go as far as to say necro/dark is stronger than any X/poison combo one can make in almost any scenario and very possibly in the top 2-3 strongest possible mm combo's.

I've seen what my necro/dark at 41 can do already. I can literally solo Deathsurge already except he runs around so much that it's hard to keep maximum -resist and -regen on him. His aoe attack hits maybe 1 out of 10x and doesn't 1 shot even the tier 1 zombies with -50% damage on him.

I originally made my necro/dark after pvping against a skilled necro/dark on my ss/ela brute. I still remember(and this was about 3 years ago, severe altitus is why my mm isn't 50 yet) how even with rage's 32% tohit, 2 acc so's in attacks and popping an uncanny insight and small insight I could not hit him and was summarily execute'd repeatedly. I never could beat him.

Zombies by themselves aren't the greatest, but their synergy with /dark is practically unrivaled by any pairing save bots/traps. I cannot comment on their performance with any other secondary besides /dark and I can see how people would think they weren't that hot with certain secondaries. Necro/dark is in fact not squishy. Every zombie can self heal itself for around 15% if I remember right on top of your twilight grasp AND your dark servant's twilight grasp. I routinely see +300hp heal from my twilight grasp immediately followed by my dark servants for another 275 or so and he fires his off about once every 10 seconds.

Also consider that while ninja's have higher dps they are actually squishier than necro's having lesser resistances and no self heal. Also consider that necro's do negative, toxic, smashing and lethal damage and all in steady amounts.

my Demon/Traps mows down the competition it's been quite fun

My Demons/Dark has soloed every GM/AV I've come across (including Lusca). Its the most powerful MM I have, and I have many.

-defense is a very good point for MMs, whose pets can be as much as -7 vs the targets.