Coley, I flail my own 2 acre paddock every fortnight, the customers every month or so ( depends if they have the cash! ) The flail will give a stripe finish and I keep it short for free range poultry. The only topper I have liked was a Big Bee from the US, they are quite compact. I frankly dont like them much as the sheer bolts break too easily. The flail will only jam usually and they are easier on the linkage for travelling, the toppers tend to put more strain on it on the road due to implement swing.
Just my two pennorth!