My wife has the grey sport and likes it a lot. Granted she has only had it for one week but it seems to be holding up well.
For me, I got the green sport. I love the SS model but I had a SS model before the apple watch and it was prone to scratching.
I chose the sport for my wife and I because when they come out with the next generation of Apple watch, the amount lost will be less painful. If I got the stainless model, the one I want is close to 300 more so that is harder to justify. I will probably get 1 or 2 more bands for my watch from Apple.
Keep in mind that you can always change out bands across the entire line. In other words u can use the leather loop found on the Apple watch with the sport model and vice versa. There are a lot of images and videos on the Internet that show the different variations.
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