Test drove two Ariens Razor mowers. Model with Ariens 159cc seems easier to handle

Hi. Looking for SP mower to replace old MTD pusher. Lawn in just a bit over 1/4 acre, but sloped, with a steep hill/swale in the back. Also trees to maneuver around. Did not like the thumb controls on the Hondas. Tried out at local dealer two Ariens razors. 1 with 159cc Ariens (Lorcin?) motor and another with Subaru 175cc. Like the ease with which Ariens back up after drive released. The one with the 159cc engine seemed a bit lighter, easier to maneuver, and easier to control with trigger when in drive. The one with the Subaru motor not only felt heavier, but jumped out like a bat out of hell when the trigger was depressed. Maybe too powerful? Ariens dealer had a nearby hill at least as steep as the one in my yard; both mowers took it in stride. Are my observations correct? Is 159cc mower better for me?