Hey Lidrach! The main differences between each of the four Witch Doctor sets you mentioned are in how they play, what skills they synergise with, and what other items complement the set. Carefully reading the bonuses for each set (I’ve listed them all below) will help to shed more light on where the set shines and how you can turn those bonuses to your benefit. The short version is that Helltooth is best for mid- to long-range pet builds, Jade for doing damage over time (DoT) at mid-range, Arachyr for getting up close and personal and channelling Firebats right in your enemies’ faces, and Zuni for both darts and pet builds at mid- to long-range.
Helltooth Harness
- (2) Set:
- Enemies hit by your primary skills, Acid Cloud, Firebats, Zombie Charger, Zombie Dogs, Gargantuan, Grasp of the Dead, Piranhas, or Wall of Death are afflicted by Necrosis, becoming Slowed and taking 3000% weapon damage every second for 10 seconds.
- (4) Set:
- After applying Necrosis to an enemy, you take 60% reduced damage for 10 seconds.
- (6) Set:
- After casting Wall of Death, gain 9000% increased damage for 15 seconds to your primary skills, Acid Cloud, Firebats, Zombie Charger, Zombie Dogs, Gargantuan, Grasp of the Dead, Piranhas, and Wall of Death.
In terms of sheer variety of builds, the Helltooth set has it made. Because it buffs so many different skills, you have a lot of options when it comes to putting a build together and picking complementary legendary items - you can find separate builds that combine the full six piece Helltooth set with Acid Cloud, Firebats, Gargantuans + Zombie Dogs, Grasp of the Dead, or Zombie Charger. In general, the Helltooth playstyle is fast and bursty, which makes it ideal for speedfarming. However, the breadth of the skills it covers also means that it lacks the specificity of the other sets, and, as of patch 2.6.7, it’s the weakest of the four sets.
Raiment of the Jade Harvester
- (2) Set:
- When Haunt lands on an enemy already affected by Haunt, it instantly deals 3500 seconds worth of Haunt damage.
- (4) Set:
- Soul Harvest gains the effect of every rune and has its cooldown reduced by 1 second every time you cast Haunt or Locust Swarm.
- (6) Set:
- Soul Harvest reduces damage taken by 50% for 12 seconds and consumes your damage over time effects on enemies, instantly dealing 10,000 seconds worth of remaining damage.
The Jade set excels in dealing damage over time (DoT). It’s a lot more narrow in its focus than the Helltooth set is, so you don’t quite have the same number of options when picking skills to complement the set. It’s also not really the kind of build you can play while distracted, as killing enemies requires a fair bit more ‘set up’ than most other builds, and making a mistake in your rotation can cause it feel like you’re hitting enemies with a wet noodle
You have to bunch them up with Piranhas, DoT them with both Haunt and Locust Swarm, and then harvest their souls with Soul Harvest. Because it requires all that set up, it’s not the fastest build, and you probably won’t see it being used often while speedfarming rifts, but it’s definitely one of the strongest WD builds, and there’s something incredibly satisfying in pulling in a big group of enemies and watching them all topple like dominos.
Spirit of Arachyr
- (2) Set:
- Summon a permanent Spider Queen who leaves behind webs that deal 4000% weapon damage over 5 seconds and Slows enemies. The Spider Queen is commanded to move to where you cast your Corpse Spiders.
- (4) Set:
- Hex gains the effect of the Toad of Hugeness rune. After summoning a Toad of Hugeness, you gain 50% damage reduction and heal for 10% of your maximum Life per second for 15 seconds.
- (6) Set:
- The damage of your creature skills is increased by 9000%. Creature skills are Corpse Spiders, Plague of Toads, Firebats, Locust Swarm, Hex, and Piranhas.
Like the Jade set, the Arachyr set doesn’t buff as many skills as the Helltooth set does, which means that you really only have a few viable options when it comes to complementary skills. Although Corpse Spiders might look like an ideal pairing, there are far and away more legendary items that buff the Firebats skill, so you won’t often see people wearing the Arachyr set using anything but Firebats. Because of the short range on the Firebats skill, the Arachyr Firebats build is unique in that it requires you to really jump right into the thick of the fight, rather than standing back at mid or long range and letting your pets do the fighting for you.
Zunimassa’s Haunt
- (2) Set:
- Your Fetish Army lasts until they die and the cooldown of your Fetish Army is reduced by 80%.
- (4) Set:
- You and your pets take 3% less damage for every Fetish you have alive.
- (6) Set:
- Enemies hit by your Mana spenders take 15,000% increased damage from your pets for 8 seconds.
Pets and the Zuni set go hand-in-hand. There are two main approaches when it comes to the Zuni set: pair it with Fetishes, or pair it with Gargantuans. The Zuni Fetish build is, without a doubt, the strongest set build the WD has at the moment. It combines the full six piece set bonus with skills like Poison Dart (a Mana spender) and Carnevil and The Dagger of Darts, both of which provide buffs to your darts and fetishes, to make an incredibly strong build. It’s really intuitive to play, and a lot of fun.