I don't have any experience other than observations while shopping, but I do have a preference. Most/all of the Korean made tractors have the same tank assembly on the left under the step up. That contributes to center of gravity. All of the 3 series JD's have the tank high up behind the seat. Orange is under the hood on small tractors whereas the Grand L's are low and to the right. I personally like the low tanks for COG and filling convenience. Some are scared of damage so if heavy off-road is an issue, then you need a different tractor or make a guard for the tank.
