Whey Isolates
Whey Isolates are a fast absorbing form of protein (not the fastest however), and tend to have a higher price point (time is money after all).
This form of protein tends to have low carbs and sugars so are perfect for people on special diets such as paleo or ketogenics. This form of protein is at least 90% protein due to fat and lactose being filtered out. Depending on your performance level, this protein might be worth the extra buck.