It was, in fact, in the second world war that the utilization of wedding bands by men became commoner. ( Note that mens wedding bands and mens marriage bands are interchangeable, both meaning the same. Given this practice of wearing mens marriage bands was moderately new it was all of the more creditable that these men were prepared to decline the marital obscurity open to them from not wearing a ring and actively selected to make a public statement about their choice. The modern man may consider it his duty to pick to make the same public marital statement as his other half will. But in most weddings, this isn't unvaryingly the case. One out of each 2 unions in America is failing and will explode in divorce. Marriages fail thanks to the variations in the two folks concerned, due to conflicts and varied issues in life.
So you've got both decided that he'll wear a men's marriage band. Once the person or couple have decided to get a men's marriage band for him there are still decisions to make.