I prefer the root rake curved tines, myself. But i have an ASV RC-30 which is different, and I live down in flat Florida, and it gets a bit plastic here.
My grapple is a Millonzi 48" with one grapple in the middle, and it is a good device. I do pick up big stuff and cut it at waist high which is good, but I don;t cut close enough to ruin chain either...
Its a big grapple....
I like grabbing a batch of ten foot limb wood and dissecting it with with a sharp chain. the remaining pieces get dropped over a pair of logs and get finished, or left to burn that way.
I have plans to build a grapple opposite of what most would think, its going to be 18''.
I swear, I wish I had a use for firewood.....