The biggest differences lie in the aesthetic design of both boots, with the newer Vapor VII having a more striking look. Plus the removal of the lace cover is pretty evident and a welcome change in my opinion! But, you will also notice from the close-up of the front region of each boot that the Vapor VII has a smoother angle into the toe, whereas the Vapor VI has a more rounded look. These allows for a more snug fit along the top of your toes.
If you looking for more information on each boot check out the reviews – Vapor VII review and the Vapor VI review. In terms of buying, you are going to find better value with the Vapor VI since they have been on the market longer. Prices vary depending on the colorway, with the Cactus/Anthracite colorway currently best priced at $145. The Vapor VII are currently full price since they are new to the market, around $199 for the Red Plum colorway.