John,
If you haven't bought yet, consider this: I got to try out my grapple today for a little bit and I realized right away one of the disadvantages of claws with slight bends coming together vs. a traditional L shape. With enough L in your grapple on the bottom, you can sort of use it as a bucket. I.e. you could pull up to a pile of lumber and open the grapple then curl it up so you have a little tray leaning back where you could stack a bunch of stuff (assuming you weren't planning on crushing it but just moving it). I needed to move something fragile and I don't have eough curl to keep it flat enough to stack so my grapple isn't really going to serve as a bucket. If I want to carry something, I'm going to have to swap the grapple for the bucket and then back again. It's not a huge deal breaker, but would be nice.
Now, that said, because my grapple is more like a couple of crescent moons coming together at the point and already pointing down rather significantly, I can open the mouth wide and come straight down on a big pile and then grab the pile. If the L is too flat or has too much curl in it, this might be a challenge.
My suggestion to you would be to see if you can find some documentation that has the shape of the L and the curl limits on the grapple so you know what your max/min curl looks like before you jump in head first.