difference between gold and silver?
The biggest difference between the two is the surcharge you have to pay for AMC Dine-in Theaters. With gold you will pay less. I found that out when I was in Orlando's AMC Dine-in.
Others have already mentioned that silver requires you to wait 2 weeks whereas gold let you see new movies. But most theaters don't have reserved seating and they don't check for tickets. So I often used silver on older movies to watch the movies that requires gold.
And as some pointed out, the surcharge for IMAX and/or 3D is exactly the same for gold and silver. So realistically gold and silver are pretty much the same. Other than the Dine-in theaters I haven't found a situation where gold ticket will cost me less out of pocket.