MIrage rune and sigil question

Recently the PvE Mirage was using Renegade Runes and Malice Sigils. What happened that caused it to switch to Nightmare Runes and Bursting Sigils?

Swapping from sigils/runes:

• 10% duration from Malice to 20% duration from Nightmare.
• 5% condi dmg from Renegade to 6% from Bursting.

Losing some in process but capitalizing condi dmg. If its pve, maybe for Confusion (?encounters like Largos etc)

Why wouldn't you use Malice over Bursting? With full ascended gear and expertise infusions using Malice still wouldn't have me at 100% duration.

I'm sure the answer is simple, I'm just not knowledgeable enough.

@Toku.5972 said:Why wouldn't you use Malice over Bursting? With full ascended gear and expertise infusions using Malice still wouldn't have me at 100% duration.

I'm sure the answer is simple, I'm just not knowledgeable enough.

On full ascended Viper's gear (with Nightmare Runes and food) using Malice is a 5.35% damage increase while Bursting is a 5% damage increase.

Breakdown rune + sigil:

Renegade + Malice - 5% condi dmg + 10% duration.Nightmare + Bursting - 6% condi dmg + 20% duration.

@Toku.5972 said:Why wouldn't you use Malice over Bursting? With full ascended gear and expertise infusions using Malice still wouldn't have me at 100% duration.

I'm sure the answer is simple, I'm just not knowledgeable enough.

Need more clarification here, Nightmare + Malice - 30% condi duration?But as for why not malice over bursting, it depends on does extending 10% of the base condi duration(usually by mili seconds) over increasing 6% condi dmg flat worth it.