Mullins, when you say "long swims", do you do any suface swimming or only dynamics?
Anyway, like spar8 pointed out - it is so completely individual and dependant on the divers level, background, strengths, weaknesses and experience.
For someone completely untrained in any sport or apnea - basically just getting into pool and doing SOMETHING will already bring huge leaps of progress. Or getting of the couch, basically.
For someone with a strong background in other sports, focusing on the very specifics of apnea diving will probably be the best strategy.
For someone completely untrained in other sports, but some aquatic background, investing a little on fitness, strength, and such things, will probably bring a lot of benefit.
For someone who is an expert elite level diver, it becomes harder and harder to find the "problem areas". They must work continuously just to maintain their current level and progress is made in ever smaller increments.
Statics are mainly good for one thing - they teach a lot about the feelings, signals and mental side of apnea. But once you've done them to a certain degree - I agree, for CW or DYN it is next to useless...
So basically there is not right answer to this question. You would need a coach who will take your individual starting point, your schedules and ability to allocate time, motivation, goals etc...And them maybe after a few years he might have a pretty good idea where you should head
But basically to give any sensible answer one would need to know:
-Your current level and experience
-Your current training
-Your goals
-Your motivation and ability to invest time and effort