I have an original Gryson Olivia w/brass hardware, but I love how the bag looks with silver hardware. It looks like such a "grownup's" bag. What will you be using it for primarily? If you work in an office setting, or have a position of seniority, the black might be more suitable. But if you're going to use the more bag more casually, the brown might be better - I think the brown/black combo is a little more casual looking (sporty?) than the all black bag (esp w/silver hardware).
No matter which you decide to keep, I'm sure you're going to love it. My bag is about a year old, and I was surprised at how much softer the leather/handles were than the ones I saw recently at Nordstroms - that's how that leather is, it only improves and softens with age & use!