Conventional versus cabover. Cabovers are less expensive, and are more maneuverable. But there typically are made in Japan, and the engine torque is relatively low. Also, some object to the ride, as many don't have enough space under the seat for air suspension. The larger wheels are better for ground clearance and comfort.
Automatics are nice.
600 series Allison transmission. The 500 series comes with lower HP and torque engines. And unless you have it, you'll find yourself slipping on wet grass. Don't get 5 speed. The 6 and 7 speed transmissions are much better.