I am looking for a 35 to 40HP tractor. I found these 2 New Holland TC40 DA or NEW HOLLAND WORKMASTER 37. The Workmaster is a 2016 for 19,800 and the TC40 is a 2008 for 17,900 wit 300hrs. Besides the 3hp difference. Is the 40 a more heavy duty tractor. Or, are there any other major differences?