I looked into the wire clamp tool just last week. Brand new costs between $40-$50 on ebay. I do like the idea of being able to double wire it and also the ability to use stainless wire,...making a nice neat rust free connection. Still thinking about purchasing it,...
I suppose the main benefit over the banding tool is the Camptite tool can be used with basic hardware store wire which makes it very convenient. But,..having the bands on hand wouldn't be as big deal neither,..just order enough and don't run low. It isn't like they're used everyday anyhow. So,..that's not really a big factor for me.
I think the banding tool makes a better factory looking connection,..but it seems the tool is more money.
I also like the idea of pinch clamps, and pex.
Jeff