This really depends on the rest of your army. If you run a primary detachment of Chaos Marines with all Nurgle stuff (with long range firepower too), then Epidemius is by far the best Daemons Herald, but in an Allied detachment.
But in straight up combat, obviously Skulltaker is the best, worth the extra points vs a regular Herald of Khorne because of the 4+ instant death rending attacks. But you'd need to run him in a huge unit of Bloodletters or preferably 8 Bloodcrushers. It takes that many bodyguards just so he can make it into combat.
However, I find the most useful Herald all around is a Herald of Tzeentch on a chariot with Bolt and/or Breath and/or Icon, and Mastery (only can take 3 gifts). The Icon is handy as when the Herald comes in you Turboboost to get good positioning, usually in my less favored wave choice, so the good units from my preferred wave don't scatter Turn 2/3/4. Plus if you can be firing a Bolt/Breath that'll hurt stuff, or Bolt/Gaze you can wreck light vehicles/Dreads from the rear. And he's cheap, like 125/130 points.
But none of them will replace a Bloodthirster's onslaught. A Nurgle Daemon Prince with Breath/Wings/Hide/Flies would be good, at least you could have a Swooping Breathy tough model who can land, Breathe, and assault into cover too.
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