If you are looking for the most realistic flame that resembles a wood fire, vented gas logs are your best choice.  These produce tall yellow flames that wrap around the logs creating the natural warmth and ambiance of a real fire.  Vented gas logs need to be installed in a fully operational wood-burning fireplace as these logs do not burn the gas cleanly and generate some exhaust that is very similar to a real wood fire. For more information visit Emberside.