In Forrester's 34-criteria evaluation of sell-side platform vendors, we found that AppNexus and Admeld led the pack because of their highly granular controls for publishers and proven ability to support a diverse array of sales opportunities. These leads, however, are far from insurmountable, and they face strong competition from other leading vendors — notably PubMatic and Rubicon Project — which are aggressively ramping up their development efforts and turning once-distinguishing platform features into table stakes. Customize this Forrester Wave™ to determine which sell-side platform partner suits your needs best.