Your "if" also depends greatly on how many points a person wants each week. 3000? 5000? 10k? 15k?
Aren't there only 3 possibilities?
1. You do whatever is sustainable in the tournament
2. You do more than what is sustainable (for a while)
3. You do less than what is sustainable (and stockpile troops)
I'm not sure why anyone would stockpile troops, and doing more than what is sustainable is... well unsustainable.
So that leaves doing what is sustainable as the only logical thing left to discuss.
So, the question is: Does completing 2.X chapter's worth of techs in order to unlock 4* units lead to a higher or lower sustainable tournament ability?
Is it better to have: 10% more HP, and +10% Damage, and Defence vs certain units and ~30% larger SS.
Also the +~30% is for all of your fights, but I assume you don't unlock all 15 four-star units? so that +10% is going to be worth a lot less