No, in my opinion if you're referring to strength of both characters then clearly Ironman wasn't stronger than Hulk.
Why so? As in the story of endgame, it was mentioned that Hulk was created due to gamma radiation (ofcourse serums was important part) and gauntlet would release gamma radiation upon use meaning he might be able to use it with caution and still end up burning his hand.
And clearly in the case of Ironman, he was simply human with extra strength from suit. He weild infinity stones temporary through this suit's nano-fiber technology to hold it for small instance of time although ends up giving his life in such supreme act of snapping fingers.
So if may be Ironman use power from his suit to snap his fingers and if we refer to @Dave's answer, restoring "rest of half the universe" takes more strength compared to vanishing "Thanos and his army" & that's why Hulk struggled and for Ironman it was piece of cake.