Zip line tours

Which port has the better for zip line tour? Skagway or Ketchikan?

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I'd like to know this, too. They're all rated as "difficult" in the description. But the reviewers rate them from easy to difficult. I did a snorkeling trip in Grand Turk in January that was also rated as difficult and certainly wasn't. We've done ziplining with no problem, but there was one adventure tour with rope bridges (no problem) and rope ladders (big problem!) None of the reviews mention rope ladders. But we'd really like to know before we book.

Thank!