Both systems are being used in my area. Ag leader makes a very good product for the money. The JD system is more money, but the reciever and display can be used in the JD 4700 sprayers, 1900 air seeding carts, and the varible rate planters, and the new row track stuff. Oh, I think the JD mapping software for your home computer is supported by Gateway computer company. Hear they are very helpfull.