I went for the RancherATV for 2 reasons. First was the ability to have the wheels either on the side, or out the back of flail. Having them out back enables you to get much closer to fences, hedges etc. Second reason was the HP available on the engine I purchased.
Double check the engine on your flail, try and stick to Briggs&Stratton or Honda. Engines are reliable and spares easily available from numerous sources. Chinese engines like Loncin are cheaper Honda copies made with softer metals and not as reliable.