The reason I recommended an Intel build over AMD is quite simply because it's faster. Not all Intel CPUs are faster or better than the AMD equivalents but in this case, for a fairly high-end gaming rig, I just couldn't recommend an AMD build. It doesn't help that there isn't a great range of good AMD boards these days either, at least not for the AM3+ socket, as it's a bit of a dead end. AMD are great for lower budget rigs, their APUs are excellent and I'd be happy to build around one of those if appropriate, but for most situations these days I'd go Intel.