I have been looking at both the Cub Cadet and Troy Bilt 50" ZTR mowers. I'll be mowing about 1 acre. I'm a first time buyer and don't know much about either one! They are both $2999. The Cub has a 22HP Kawasaki Twin-Cylinder, and the Troy Bilt has a 23HP Briggs & Stratton. Any suggestions...