I prefer the 7 stone. I think the eternity is a bit bulky, I don’t think it will be as comfortable, it’s easy to crack a stone on the underside of your hand, and the size can never be adjusted.
I’m really hard on my eternity band so I don’t recommend them, I had a desk job and took my rings off when I got home from work. Unless you have already had one and know you are cared then I say go with the 7 stone, you won’t be seeing the bottom of it anyways