They all trade about the same price wise. You will always find someone with a preference of one over another though. Given a choice, I would lean to the American Eagles or Buffalos. The buff has a wonderful design and has an advantage of being 24K pure, which some will prefer.
There has been considerable commentary about one type of coin or another being more subject to confiscation buy unca sugar. I don't buy into that argument, but there may be some tax considerations for the American coins. Not that I expect to have to file a return at TEOTWAWKI.
G