OK how come I hear how hard it is to hook up certain disc mowers?

I need to buy a disc mower this winter and have always ran Krone 9'2" disc mowers.I think I want to try a NH.The Krone's  seem easy enough to hook up to tractor.I have heard other brands like NH,Kuhn are hard to hook up.

Why are these brands harder to hook up and will I regret getting any other brand than Krone when I take off and on tractor?   

OK how come I hear how hard it is to hook up certain disc mowers?