Ag man. This is such a beautiful post hey. I think the diamond ring is better simply from a durability perspective. Whatever you do, try and make it unique and if you can, try to get a ring made/ designed for her. You might strike it lucky and see the right thing at your local jeweler, but make sure it's a representation of her as well as of your love. It doesn't need to be ridiculously expensive but it does need to be thoughtful. ❤️ There's my two cents ❤️❤️❤️❤️