He "kept up" with Red Hulk and normal Hulk within the last 10 years if I recall. As in, didn't do particularly well against them, but managed to not get one shot lol. He even bloodied Hulk a bit when he was doing the World War Hulk thing.
Ben is certainly stronger than MCU Thor is my impression. I don't think he could one punch him, but would still mangle him in a prolonged h2h scenario