I am trying to decide between a Great Dane Chariot 19hp 48" cut verus an Exmark Lazer HP 21 hp 48"cut. The area I will be mowing is about 2 acres with a couple of decent size banks,. I notice that the Chariot has more rollers on the deck, will that make a big difference. Also will I see a difference between the 19 and 21 hp Kawasaki. Thanks for any advice.