It also depends on what you are farming. Eternal chaos has a better shot against the "very hard" gods. a turn 2 neurotoxin gives you a chance to beat anyone. That being said, after playing about 100 games with each, I think eternal chaos is slightly more fun to play, but this deck wins much more consistently.
edit: i don't keep stats, but if I had to estimate I would say this deck wins over 60%. Possibly the highest % deck I've ever tested, and I solely farm FG's