I've used Rodent Pro and Big Cheese, and I prefer Big Cheese. They vacuum-pack the rodents, and Rodent Pro doesn't. It seems like Rodent Pro just tosses the rodents in a bag and freezes them, so they get kind of tangled up so it's a little hard to separate them while frozen. Big Cheese lays them out in a tidy row so they come apart a lot easier. I've also heard that some people have had quality issues with Rodent Pro, but I didn't have any trouble in that regard. Prices are about the same.