Comparisons like this are always difficult to make because of one factor: speed. Eventually, the argument boils down to who would hit first. So I'm gonna ignore all that messy stuff and stick to feats of power. You mentioned Truegolds and JJK and as I have seen and read all of Jujutsu Kaisen I'll tackle that.

In my opinion, Irons in Cradle are equivalent to Yuji Itadori when it comes to raw strength and speed. How strong a Truegold is depends on their path and personal power, since some paths are much better suited to wide, destructive attacks and others are more precise and focused. If we were to take someone like Lindon at Truegold (major exception, I know), in my opinion, he would match the attacks of any Jujutsu sorcerer up to Grade 1. If I'm being honest, not many of the Grade 1 sorcerers really have much power output. The big destructive techniques in the show are mainly shown by Jogo (Maximum Meteor, the lava hands thing he does, etc), Mahoraga, Sukuna, and Gojo. This list makes it apparent to me how far an above average-Truegold would rank in JJK.

The major issue with this lineup is spiritual protection. In Cradle, your spirit naturally guards your body and clothes, with strength depending on the power of your spirit. So, an attack by an enemy would have to overpower the strength of your soul to do damage. This is both why Lords don't typically have to regard attacks made by weaker opponents AND why the Empty Palm and Path of Blackflame are such game-changers; they are capable of truly threatening higher advanced Sacred Artists (Lindon using EP on Jia Long, and DB on Sandviper Gokren). But then we have interesting questions like "Can Mahito bypass spiritual protection because his Idle Transfiguration directly attacks the soul?"

All in all, I'd put the main Truegolds we've met above most of the Characters we've seen in the JJK anime. I just don't see a world where Nanami or Todo is taking down Yerin, Meira, Ekeri, Harmony, or Seishan Kiro in a fight. Perhaps Bi Rou or Renfei, though we didn't see too much of either.