The difference between new gold coins and various years gold coins is that new coins come directly from the mint and usually bear the year of the current issue. These coins are uncirculated, often include the latest security features depending on the producer, and are therefore slightly more expensive.
Various years gold coins are previously issued coins purchased from private individuals or institutional investors. They are generally more affordable, may show slight signs of use, but have the same gold value as new coins when resold.
New gold coins come directly from the mint. They usually bear the same year as your order and can be recognized by the year of the current or upcoming issue listed in the product name.
Various years gold coins are from earlier years of production or issue and are purchased from private sellers or institutional investors.
If you prefer a new coin that comes directly from the mint and includes the most advanced security features (which vary by producer), choose a new coin. If you are an investor looking for the best possible price and the most gold for your money, choose a various years gold coin.
Read more here about selling gold coins.