I usually recommend AMD. But MMO's are notoriously known for being single threaded and Intel is known to be superior at single threaded performance. If you can afford it, get Intel. If you're dead set on AMD, then forget FX and get an A-10 7850K and FM2+ motherboard. According to Yawa on here, his 7850K @ 4.5 ghz was better than his FX-8320 @ 4.9 ghz in Guild Wars 2 which is also an MMO.
2/7/14 at 9:49pm