i have seen both and tasted from both and i can't tell the difference, i think it comes down to preference. i do think it is less expensive, and maybe even a bit less hassle for batch sparging. but once you have a set up likw yours all you would need is a pump and fly sparging would be a great operation, i honestly don't know if you need a round cooler for fly sparging or not as long as your water level is high enough to not hit your grain bed i don't think you would. i think fly sparging allows for a smoother transfer, and an over all cooler look, if that matters. (i kind of think it does)