Bracelet for sure. If you want to wear it on rubber down the line, it's easy enough and cheap enough to get a quality rubber strap and change the bracelet out. A Bonetto Cinturini natural Italian rubber strap costs something like $30 and an Isofrane costs about $100. If you get the rubber and want to get the bracelet down the line, finding one for your Breitling will take time, effort, and much, much more money. I bought my Speedmaster without a bracelet because I didn't like the 1998 bracelet it's sold on now, and when I decided to get a bracelet, I searched near and far to find the right 1171, a much older bracelet (and even still, it cost double what a really nice leather strap would cost).
Plus, should you ever decide that the SuperOcean no longer floats your boat (see what I did there?), the bracelet will increase resale value.