system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Tony Stark can't manufacture the super soldier serum? Or doesn't want to?

No records exist, all copies destroyed.  But this is Tony Stark we're talking about.  His dad invented the SSS and he is the greatest mind on the planet.

If he could engineer the SSS he could power up all of his friends, or at least make one copy for himself.  And we all know how much Tony loves Tony.  

But he hasn't done it.  Which leads to one of two conclusions.  Conclusion 1 - He can't do it.  C1 is inconsistent, he's created a new element, a sentient AI, and developed bleeding edge technology.  Conclusion 2 - He doesn't want to.  C2 is also inconsistent because he is a selfish pragmatist.  

So which is it?
gpt
Howard Stark didn't invent the Super-Soldier Syrup, Dr. Abraham Erskine did. And Tony is more of an engineer than a biologist, so at the very least this stuff is out of his comfort zone.

And it varies by continuity, but the SSS is often unpredictable and doesn't simply turn you into a peak-human specimen. In the MCU it turned Johann Schmidt into the Red Skull. Who knows what it'd do to a middle-aged Tony Stark?

Lastly, the Iron Man tech is clearly more advanced. The SSS turns a 90-pound weakling into a one-man army, but something like the nanosuit can turn the same man into a walking, flying WMD.