What's the best choice?

[GAGA Extrem]

State Capitalism is great if you have to build up the industry, L-F is good if you have a powerful base of capitalists that can build factories by themselve, interventionism is good if you want to maximize your IND score without having to build everything yourself.

 

[GAGA Extrem]

The big downside of State Capitalism is that you have to upgrade the factories yourself. I'd much rather if they switched it: it would be better if capitalists could upgrade factories but not build new ones.

Well, upgrading all factories is one SHIFT click. Twice per year and you are fine.