keep the bev, and return the other. i agree that they are very similar. maybe you could exchange for a black or white riveting if you really love the style and size?
The Beverly looks like it "hangs" on your shoulder better, vs the Riveting which looks more snug (shorter straps). However, I personally prefer the Riveting because it's funkier.
The beverly looks perfect on you...however, the riveting is more eye-catching and I'm sure the leather will soften up with time to suit your body more....I'd say keep the riveting!