Your product links are a little hard to decipher, but this tool from Brownells would be my choice.
That said, the piece of scrap wood with a hole slightly larger than my J-frame extractor rod and with a saw cut to allow it to be squeezed around the rod by my vice is the no cost option that serves my purposes very well.
Other than being wood, rectangular, and using the vice instead of a screw to tighten the grip, it is pretty similar to the Brownells tool.
Oh, and it is worth mentioning that with a wooden tool, you can grip any part of the rod, including the knurled section, with marring anything.