Universal-tier power vs a man in a robot suit — the technology gap is irrelevant at this scale.
Tony Stark's genius has built armor that fights gods. But Goku IS functionally a god — a universe-threatening being that moves millions of times faster than light. No amount of engineering bridges this gap.
Iron Man's most powerful suits have fought celestial beings, but Goku's power exceeds even that tier. A casual ki blast from Goku could destroy the planet Tony's standing on.
Tony's genius and adaptive armor have fought cosmic threats. His AI analyzes opponents in real-time.
Goku's power is universal-scale. Ultra Instinct makes him untouchable. The gap between Iron Man's best suit and Goku's base form is astronomical.
Goku wins instantly. Tony is a genius, but genius doesn't help when the opponent can destroy universes with a punch.
Goku also fights
Iron Man also fights