NH Sage vs Demon sin

They're about the same... Same as it's always been. Though a couple thoughts on what you've said.

3 spark APS is not effective anymore in any PVP situation in which you'd need that much damage.

Bleed from Elimination, or any bleed for that matter, is a non factor in PVP due to reductions. Anything that ticks bleed for more than 200 hp every 3 seconds would have died to elimination.

Cursed Jail of either culti typically does less damage (though has the potential to do more) than it's level 11 Headhunt counterpart. Sage is 1 spark, demon gets an extra second of stun. The reduced spark cost is always useful. The extra second stun is rendered worthless if it's blocked by tidal or anti stun, or if it's removed early from purify proc, or faith (or even omg Purify! - why do I almost never see EPs supporting anymore?) which these days is more often than not.

Chill... diminishing returns will never result in less being better >.> Sage gets 40, demon gets 35. 40>35 therefore sage chill is better than demon chill.

TBH, when looking at just the primal skills, demon's got the short end of the stick... Demon add for Life Hunter is only really effective in pve, for Elimination is a nonfactor, for Cursed Jail see above, and Chill hasn't really changed. Passives give more skill damage which leans away from demons' APS advantage, more crit (from both passives and rb stats) which reduces the effectiveness of demons' mastery due to diminishing returns. Conversely, when looking at the same for sage, Life Hunter's 10% HP reduction is effective in both pve and pvp, Elimination paired with sage mastery does 48% more weapon damage, the extra 5 attack levels from chill scale with the skill damage passive reducing the effect of diminishing returns.

Now that I look again... aside from comparably cheap aps farming pre r9/nv3, what does demon have going for it again??