I have read this question in a thousand places on the Internet - and there are always different answers - C25K. B210K, Galloway, Lydiard, Daniels , etc , etc.
But the best answer to the question that I have read is :----
THE TRAINING PLAN THAT YOU KEEP ON DOING! -The one that doesn't lead to exhaustion, tiredness, illness or injury. -- The one that allows you to keep motivated such that you want to go out on each day of the plan. The one that never ends ---