None hoenstly. Ember has innate armor strip in the form of fire blast which even if you have 0% heat meter still fully strips armor in 2 casts, 1cast if the heat meter is at 90%.

Since ember is running 100-145% range usually both ophanim eyes and thermal sunders are useless in this regards. Armor strip is covered which makes ophanim eyes unnecessary while thermal sunders on such low range is redundant.

Best would be to run nourish for energy econony instead of fireblast or if for whatever reason you don't want that the other option would be roar.

For some meme build nezhas firewalker works as well.

nourish on fireblast? But then her 2 just amp up indefinitly?

Nah, nah. Thermal sunder to detonate her heat procs. It's not a great pick, but it does have functionality

i personally go with Roar, but if you have to choose between the two i'd say Thermal Sunder is better. its a very quick way to proc heat on a lot of enemies to power her passive, though she honestly does fine without it.

Standard recommendation is nourish, but I like to get my energy economy with the Exothermic augment and a yellow shard or two. Silence is too good to pass up if you do heavy duty steel path survivals.

All imho, with ember the only option is nourish, she can already strips armor and stacks a lot of heat procs and even with the new fix to her kit she still energy hungry.

I wish she gets a full rework for her ultimate, I like the idea behind a meteor swarm.. but for now it's underwhelming (also I don't like the animation).

Keep both since you know you like it? You can have up to 6 configs if you buy 3 of them with platinum. Ophanim eyes is good for a weapons platform and thermal sunder will make ember better at killing enemies with ability spam.

Cast ophanim eyes, cast fireblast once(to keep ability spam low for more weapon uptime), and let ophanim eyes deal with the rest of the armor. This still allows you to get near peak performance with non-corrosive elemental combinations. Magnetic and heat come to mind because ember has a fireball augment that boosts weapon damage with addition fire damage (like hellfire). Viral and electricity work as well, but the damage doesn't start to peak until an enemies armor is almost fully removed.

I don't have much experience with thermal sunder, but I would imagine casting speed will be important so you can limit how much time you are spent doing animations while spamming fireblast and thermal sunder. Ember's augment exothermic is also fantastic to stay topped up on energy.

Thermal Sunder (Ember already has a strip, and Orph eyes is too slow. Even if you wanted the effect take Tharros or Pillage).

That said if you stick Thermal Sunder on Ember you might as well play Gauss, beyond aesthetic preference. Theres a strong argument for that in general really,

As other recommendations go, it would depend what you’re planning to remove.