Adaptor bracket design, why one over the other?

Stiffness is the key to a successful bracket design. A caliper mount that lacks stiffness can lead to problems, even if it does not break. Deflections of the caliper mount can lead to excessive tapered wear of the brake pads, resulting in excessive pedal travel, and is a potential source for an assortment of brake noises.  A key contributor to deflection is bracket offset.  Does the bracket carry the load radially from the attachment mounts, or is it offset.  Any offset increases the torsional/twisting moment in the bracket, and results in deflection. 

The Vintage Venom brackets are beautifully radiused billet parts and are absolutely stunning!  They do not have offsets and each version of the bracket has been designed to its specific material properties.  While aluminum is sexy and light, it needs mass for strength.  Therefore, these billet aluminum beauties are almost an inch thick of T6061 aircraft aluminum!