which Pipelining architecture, should i use and how to distinguish them!
In computer architecture, there is absolutely nothing that you must do. There are always compromises, everything has advantages and disadvantages, and advantages and disadvantages change over time. 

If you learned about three different architectures to achieve the same goal, you first check how each architecture fits in with the overall design, and then you invent a fourth one that works better. Your tutor can only tell you how things were done in the past; you'll have to find yourself how things will be done in the future.