I can't say enough about the grapple. I paid $1700 for it, it's a fairly light duty model. The skid steer would probably tear it up but it's perfect for the tractor.
It's strong enough to carry a couple thousand pounds. I only know that because the hydraulics are rated for 2400 pounds and there's some logs that it can barely pick up but the grapple doesn't strain. My father has a 33 hp tractor like yours and I think this grapple would work just fine on it too. The tractor in the picture is 52 horse so it's a little more heavy duty.
I cleared the entire lot where my house is which took a couple months and the grapple is still straight. I blew out several hydraulic lines digging up stumps with it but that's it.
Once you get the third function valve, it opens up a lot more possibilities.
Sorry if I just made you spend 800 bucks on the third function valve