I'd strongly second the Frostbite, which is in fact a knockoff with some minor improvements on the Igland GR-20 that I've had for years now, and have never bent any part of it; have added the extension feet on the lower 'arms' and find to be basically indestructible on my tractor.
I push it so hard at times I have to be real careful to not let an entire tree take over by its weight and position, and need to watch I don't allow the forces twist the loader and flip the tractor on it's side if something goes wrong.
The GR-20 is the AR400 steel, I can't say for sure what the Frostbite uses, but it looks identical to mine except for color. Mine is flat black, the Frostbite is grey.
Here's a video of it, and it's optional 'grab plate' (and arm extensions) to put between the two lower arms for picking up smaller items, rocks etc.
Igland GR2 Grapple - YouTube
I've also got Igland's winch, which is also a monster as far as strength and durability. I actually broke off the swedged cable end on one log pull that hung up the cable and snapped the end. Easily repaired with proper cable clamp positioning, but I would have liked to keep the original end; oh well...
I find the grapple on front, the Kioti KB-2485 hoe on the rear, with Mie's 'ripper tooth and hydraulic thumb give me everything I need to rip, tear, lift, uproot and destruct any tree, rock or most other ground items in the way or wanting to be dug or carried.
I'm confident you will NOT be disappointed by your choice in the Frostbite. It has bushings I've been told, that my GR-20 does not have. To date, the grease fittings have kept my grapple in excellent shape with no loose joints. I've had it near nine years to date and not one issue with it. I did add expanded metal to keep sticks from poking into my radiator, and added same to my Kioti front grill pushbar as double layers of protection. That has served well in both cases.:thumbsup:
Check my avatar. It shows the grapple pushing logs further into my burn pile. Not highly recommended- I've burned up both tie-rod rubber boots over the years from that over zealous act. :confused3: