The real question you should be asking Freddy is "what do i want to get out of the sport?" If you are going for static apnea records your training would be different than a dynamic speacialist. Some people with great statics have crappy dynamics. I would try to identify my weaker skills and focus on developing those...but its always easier and more fun to do what you are good at!
Do you want to compete? Are you just in it for the challenge? Photography? Hunting? Gear your training towards your interest. When I train in the pool I simulate a stalking and hunting situation b/c that is my reason for freediving. An impressive static on the surface wont necissarily put dinner on my table
I have alot of respect for the guys who go after numbers...its something that I just can not do for some reason...put a gun in my hands though and I am an entirely different diver. I guess all Im saying is find what interest you the most, your passion, and then develope it.