Those are about the same size/shape, but I really like the bubble tubes because it makes extracting the tag dirt simple. With the one you just listed, you have to fish them our or wrap them around the cap or other silliness.
Still, to date, the best potion rep I've seen was Markus Dark's straw-pipe. It seems Burger King straws fit the exact ounce measurement for Potions, he wrapped the tags around a Q-tip, stuffed it into tube and voila, instant rep. I think he finally wrapped a whole bunch together in a pipe, coated the entire thing with brown crinkly paper and told people it was a Healing Branch from an Ancient Ent.