I have the Landpride SCG1072, which resembles the second photo (grapple on tractor). I use it for all kinds of brush and tree cleanup, and while I don't know if I'd truly be happer with the grapple of the left Steinsammler (?) grapple, I've often though a grapple with longer bottom tines would make me happier. Closer and longer bottom tines might drop less material between point of pickup and the brush pile destination.
That said, I'm not unhappy with my grapple and I'm still learning various techniques. One thing I could probably do better with mine (like your right hand photo) do an equal sided drop-from-above claw-like grab on the brush. But mostly I prefer to slide the tines along the ground to get the bottom material, and I would guess the Steinsammler is better at that . My landpride bottom tines are barely tines. For example, you can't really put anything on them (to carry) even with the grapple open and tilted, stuff just slides off because they're very curved. So what isn't secured by closing the grapple is lost. There are times I wouldn't mind being able to carry my chainsaw in the grapple, but no such luck.