AMD CPUs are more cost effective, and offer similar performance, especially in highly parallel applications where they are often times faster.
Intel changes sockets every 18-24 months, where AMD will support the same socket through two product cycles which may last as long as four years. AMD also currently has the best built-in graphics of anyone in the APUs. AMD also overclocks more easily and more efficiently.
AMD hardware is powering the next gen consoles, so the gaming industry will be more geared toward their architecture in the near future.