Most likely, the difference is in the electronics.
The best Anker also only does 60W max, 2A per port, the octo charger pushes 96W, 2.4A per port.
From the Octofire information on their site:
Intelligent overheat, overcharging and over-current protection built-in.
Only charger that can charge eight tablets simultaneously at 2.4A per ports with Smart detection of devices for optimal charging.
International Compatibility - Octofire takes 100-240VAC 47-63Hz power input. That makes it work in all countries. Octofire Turbo comes with a 1 year Replacement Warranty.