I have a Gravely Commercial 430 and a model L8, both have mower decks. Now that I have them running I am wanting to get other attachments like snowplow, rotary plow, and tiller for starter. My question is on the snow plow; I have seen two different ones. One goes under the 430 and the other just attaches to the front, is one better than the other? I will be using the plow to move dirt that I loosen up with the rotary plow or tiller. Any advice would welcome.