Resentment vs Peak Performance vs Heroics, the differences & my personal opinion.

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You've guessed it I'm gonna try to compare these 3 skills that increase damage based on HP.
If you don't know what each skill does(which sounds dumb bc it's very straightforward) then take your time reading on cuz I'll be explaining it.

The first skill I'll be talking about is Peak Performance, this has 3 levels, if your HP is 100% no spec of damage taken, you gain 5 / 10 / 20 Raw damage. Overall very efficient with damage boost per decoration slot.
This prerequisite is very easy to maintain if you're not a melee or really good at juggling a monster in solo(also not in a DoT area). Otherwise not really imo good for pub max dps method.

The second skill I'll be mentioning is Resentment, unlike Peak Performance has 2 more levels and you need to have red health bar to trigger the effect to gain 5 / 10 / 15 / 20 /25 Raw damage. This is really great if you're building for Rock-steady/Tank builds but due to its linear damage upgrade has some downsides of dropping off after the 2nd slot compared to Peak Performance.
However, if you are a melee weapon, that often take hits ie GS, Lance & GS, and Tank HBG, this buff can last very long until you out-heal the red HP bar with regen or Healing.

The third skill is Heroics, like Resentment, needs you to take damage, a lot of it, this effect only triggers when below 35% Max HP. Like Furor it requires 5 lvs to max out but the return value is semi linear like Resentment.
The effect grants,
5%Atk +15 Def/ 10%Atk +20 Def/ 15%Atk +25 Def/ 20%Atk +30 Def/ 30%Atk +40 Def.
If my calculations are correct your effective HP range is, 35 on 100 HP, 52 on 150 HP, and 70 on 200 HP.
This amount of health if you're in non tempered HR hunts are pretty risky but doable in pubs and solo, but once you go to tempered Hunts this amount of HP is a 1 shot range, this skill is deceptively powerful within the hands of a speed-runner. The buff effect is basically a more powerful Might Pill on infinite duration at a risk of carting.

Honestly in paper and if you're really skilled, Heroics is a straight upgrade from Resentment & Peak Performance as the 30% Atk up is much stronger than 20 & 25 Raw value boost. Especially when your weapon has above 150~ Raw But if you're a melee fighter that does blocking/tackles Resentment is more consistent and don't have much risk if you have Health regen while Peak Performance is good for weapons that have mobility/dodge frames. Heroics, like Resentment requires too much slots to become more efficient so that is one of the problems you have with Heroics. In my bias I'd choose Resentment if you're melee and Heroics are just a gimmicky solo speed run tool.