I haven't seen either band. I've seen Led Zepagain, they have cool costumes, but my way of thinking, if they need costumes...then something else is missing (in this case-vocals). Zeppelin USA has the best tribute band vocalist that I've ever, EVER seen, Brody Dolyniuk. If you are on fb, friend him. He plays here in lost wages occaisonally and travels all over the country with Windborn Music, doing various rock super group shows that are backed with full orchestras. This dude could have been a lead singer for a number of major groups if he was a little older. If interested, check it out.