Should I buy a D6H LGP or D7H LGP

I have a D6M LGP that i bought new , I do a lot of farm fence line clearing and it works great. The problem is I am getting so many jobs the farmers have had the trees either logged off or cut for fire wood the bigger stumps are taking to long to dig out and taking a toll on the 6 way blade. I know for what I do bigger is better, I would rather have a 7 but can’t find a LGP , On the other hand I found a really nice 6H LGP to buy , would there be a big noticeable between the 6M to the 6H...

Should I buy a D6H LGP or D7H LGP

Should I buy a D6H LGP or D7H LGP