Well, I think the Dodo Mitts seem more luxurious, and I bet they cost more to produce, which explains the greater price.
I've used a wool mitt before, and it did glide nicely across the paint, but that was someone else's mitt. I was working for a mobile detailer for a short time, and ALL of his customer's cars were covered with swirls. They were all worse looking than the cars I washed, so I asked him if he was the only one who washed his client's cars. he said yes. I did not tell him why it is I asked. I think I got my answer then.To be fair, those weren't Wookies fists, but were your basic, high quality, clean sheepskin mitts.
I had cotton chenille only at the time. Cotton chenille start coming apart after the third wash, sometimes strands come off the first or second wash, but they are soft and delicate. I would have put a $3 cotton chenille wash mitt against a $25 sheepskin mitt any time for safe washing.