We are talking about 2 different styles of clamps I think. To simplify for myself and maybe some others the two styles are crimp or cinch. The crimp tool that I got from Lowes uses the copper crimp ring. The stainless rings mentioned are a cinch ring which uses a different tool. I opted for the crimp style because that's what I had borrowed and I had heard that the cinch style may not hold up in situations where there may be excessive pipe movement such as under my greenhouse benches. That being said, I have no comparison of my own, but I couldn't be happier with the tool I got. Only drawback is getting into tight spaces. You have to plan ahead for that if you can. I don't know how that works with the cinch type. Looks like it might be better for that. At $40 it might be worth making the extra investment and have the option of either one, since I already have the more expensive model.
LOL Pitcrew, yeah I'm about a 2hr ride in any direction to a "city". My little local "city" of about 4k people has a Wal-Mart (soon to be a Super Wal-Mart, whoopie do), Hannaford, McD's, Burger King (which I'm surprised hasn't gone bankrupt), Dunkin Donuts, Napa and VIP. Those are about the only chain stores around here. I grew up here so I'm used to it I guess.