The closing banner image is described as a six-bottle best value package, while a most popular tag appears on a package card.
Best value usually means lowest cost per bottle, which is the six-bottle tier at $49. Most popular is a claim about what buyers choose, and the page offers no data behind it.
Ignore both labels and use arithmetic: 2 bottles at $79 each plus shipping, 3 at $69, 6 at $49. Then match the quantity to how long you want to try the product.