Flight and ranged attacks keep Wolverine at bay — Logan can't cut what he can't reach.
Wolverine's adamantium claws can cut through virtually any material, including Iron Man armor. If Logan gets close, those claws are going through the suit like butter. Tony's entire strategy must revolve around never letting that happen.
Fortunately, Tony can fly. Wolverine cannot. Repulsor beams, uni-beam, and missiles can all be deployed from altitude while Logan frustratedly slashes at air. The fight becomes a ranged bombardment against a healing factor.
The question is: can Tony's weapons output enough damage to overcome Wolverine's healing factor? Probably not permanently — Logan has survived being reduced to a skeleton. But Tony doesn't need to kill Wolverine; he just needs to incapacitate him long enough to win the engagement. Sustained heat from the uni-beam could potentially overheat the adamantium skeleton, and concussive force can scramble Logan's brain faster than it heals.
Flight keeps Tony safely out of claw range. Ranged energy weapons provide sustained damage output. The suit's sensors can track Wolverine perfectly. EMP or electromagnetic attacks could potentially interact with the adamantium skeleton. Tony fights smart from the air.
Adamantium claws cut through anything — one clean hit and the suit is compromised. Wolverine's healing factor means Tony can't put him down permanently. Logan is incredibly patient and experienced; he'll wait for Tony to make a mistake. If the fight moves indoors or to close quarters, Wolverine dominates instantly.
Iron Man wins at range through flight superiority. In open terrain, Logan has no way to reach Tony and Tony's sustained firepower can keep Wolverine suppressed. In close quarters, Wolverine wins instantly — those claws go through the suit like paper.
Iron Man also fights
Wolverine also fights