The Deere lights are going to be better quality, the DDMs are made in China and a 35 watt DDM kit won't put out as much light as a 35 watt light from Deere.  With that said I have some of the JW Speaker brand lights (they make the Deere lights) and a bunch (around 30) of the DDM tuning kits and for the money you can't beat the DDM kits.  The lights on your tractor will use the 9005 kits and if you put four 55 watt kits on the back of that tractor you will be amazed at how much light you will have, it will put the Deere lights to shame.