Big debate here, no right or wrong, just how you want to do it. Batch sparging is easier with more systems, fly sparging has more variables. Done right each method will give you good results. Personally, I fly sparge...like brew-boy I like playing with little things here and there and fly sparging lets you do that with manifolds, false bottoms, sprinkler systems, HLT possibilities, etc. In the end, I think batch sparging is easier to do with fewer variables to worry about.