I had a new XR3037HC for a day. It started dripping oil shortly after it was delivered and the dealer took it back and offered me a replacement. They gave me the choice of the same, or the 3135 at no additional cost. So I chose the latter.
George, I have seen some discrepancies on the info in their website. Such as I'm pretty sure both have the same size fuel tank. I'll have to verify that tomorrow for my own curiosity.
I have been very pleased with the tractor. The dash is nicer, including a volt gauge where the 3037 did not. The seat is nicer with adjustable arm rests. All the switches are nicer carling L series.
The LS tractors have some stout hydraulic systems with dual pumps, which helps support their (what I'm told) class leading FEL lift capacity. No need to wind the rpms out for the majority of work.
I would suggest the HST as well.
Jay