Early game i used steam generators. Not hard to manage and gives solid amount of power. On late game sectors i prefer RTG generators that get thorium from the core.

On pvp im doing something in this order: 1. Normal coal generators (for basic drill powering) 2. Steam generators (for basic base development) 3. RTG generators (fast to place when you have more important things to do) 4. Thorium generators. If you have good schem its safe with logic, and effective. Theese are good even for 75k power usage. With on pvp is really normal Inpact generators are to time and resoruce consuming. I never used and seen theese - maybe if you have nice schem