7 Star Tech Champion to Rank 4

I’ve 100% explored the Epoch of Pain and obtained a Tech R4 gem. My only R3 tech champion is Shuri, but I’m hesitant to take her to R4. In your opinion, who would be your preferred choice for the Tech class R4 worth?
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Bastion or Prowler or Zola would be my pick.
And if you want to go funky, then someone like Lady D would really benefit too.
These are my 7 Star Tech champions
That’s a nice looking awakened rocket raccoon right there
Since you don’t have Ironheart - Shuri or Warlock are both incredibly useful and solid champs, can’t go wrong. If you’d rather pick someone a bit more spicy, Jack and Shocker are great attackers. Zola or Red Skull for defense. I’d be tempted by that Hulkbuster…
Tech is a tough class - it depends if you want to rank for who you use or who you like. Don’t be afraid to rank for fun
Just keep doing sp1 to build up shock DOT on enemy and to keep doing critical hits.
She's my #1.
Bastion, Zola, Prowler (if you know how to use him), Shuri and Ironheart are solid picks to r4. If you prefer other, that’s acceptable as well.
While Iron heart has an Armor up effect, she’s Immune to Reversed Controls, Incinerate, Coldsnap, and Frostbite. Additionally, her personal Debuffs are unaffected by Ability Accuracy modification against Mutants. She has a pre-fight which she can use if someone is immune to incinerate, and deal ruptures instead. also while the Opponent is suffering from 5 or more debuffs, Ironheart inflicts a Tracking Passive, bypassing the effects of Miss.
Opponents that are #Robots or are suffering from a Tracking effect suffer -100% Offensive Ability Accuracy when hitting Iron heart’s Block. Mutants suffer a -150% reduction.While a Tracking effect is on the Opponent, Ironheart’s AI can predict enemy attacks, allowing her to trigger the Parry Mastery against non-contact attacks and Block Mutant’s un-blockable Special Attacks. Her heavies can also slow power gain, and her sp1 lowers the opponents physical and energy resistance, which only ups her damage.
The only thing stopping me from rank 4ing Ironheart is I want to see how good Bastion is.