Haven't we had this whole Vision argument before?
- We agree he seemed very powerful in Age of Ultron (beat Ultron Prime, fought Thor in a deleted scene).
- He presumably held back a lot in Civil War because he didn't want to kill anyone on Team Cap (almost everyone in the airport fight was holding back).
- We did see some of his limits (stunned by electricity, overpowered by Scarlet Witch, Falcon dodged his beam and it hit War Machine) but nothing that suggests he's weaker than Iron Man.
- He was backstabbed at the start of Infinity War and spent the rest of the film badly injured.
Not exactly a fair comparison.
How long would Tony have lasted if he'd been impaled twice before Thanos showed up?
Sure but with a sneak attack. They backstabbed him with an alien blade that can seemingly cut through anything (including vibranium and Asgardians). Then Vision spent the rest of the film badly injured but kept fighting until he died.
Iron Man suit or not, being backstabbed by that thing probably would've killed/grievously injured Tony (or almost any other Avenger).
MCU Vision was easy to stun with electric shocks, no argument here.
I actually don't remember seeing any Iron Man suits with a taser though so it seems unlikely it'll be the deciding factor in this fight.