The big difference here is that even if the Condition is false, the program will have executed the Condition at least once. While loop is the Do Until loop. This loop will first examine the Condition, instead of examining whether the Condition is true, it will test whether the Condition is false. Until loop will execute the the Statement first, then it would examine the Condition. Next If you don't know how many times a statement needs to be executed, you can use one of the Do loops.
Next loop offers a better alternative.
Next Used for counting, the loops begins counting at the Start point. It then executes the Statement or Statements. Next, it increments the value of Counter by 1 and examines the condition again. The formula above will increment the counting by 1 at the end of each statement. If you want to control how the incrementing processes, you can set your own, using the Step option.