Not that simple. For WoW yes, but we're talking about new released games. If you played WoW or other Blizzard games and had no intention to play any other game, then Intel. What's that, Blizzard games? Get a G3258 or an i3. Done, go home.
But if you played other games, then we'll have to talk. But generally if you play a lot of games then it's not as simple as go Intel. If your budget can support it, anything beyond $180 for CPU is clearly Intel. Anything bellow that is clearly not. See me recommend a 4100 or 4300 to anyone? No, cause they generally suck, especially for that price. For $100 it's clear that AMD is exploiting people who already have AM3+ motherboards and just want an upgrade. On the other hand there's the AMD 760K which is actually not bad for the price of less than $80. That puts it up against the G3258.
Nearest set of benchmarks I could find to compare them.
When it comes to i3's then the price range gets strange. At $100 you get the 4150K, but at $110 you get the FX-6300. At $160 you get the 4370k, but for $10 less you get the 8320. Do the extra cores matter in the long run? Just asking Dying Light. There's no mention of an i3 as the minimum requirement, but the 8320 is listed. At one point they just listed quad core as minimum. Intel dual core is better for the here and now but will it for the near future?