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Based on just images alone, it looks like the only reasoning between the two bridge types is architectural. I believe the span, and elevation for the the buffalo bayou pedestrian bridge is longer and higher respectively than the Brays Bayou Bridge. That being said, the loads and spans associated for both these bridges are so low that (to an extent) the only legit worry is cost... because buffalo bayou appears longer, it may have been less feasible from the cost standpoint to do some crazy architectural structure. Finally, from an engineering standpoint the Brays bridge pictured above is kind of a silly design, but thats why architects make the big bucks compared to us structural engineers. Also, just to clarify I do Power Plant/Oil Refinery Civil work--- so my knowledge may somewhat be limited.