I personally appriciate the influence, research, economic.
I always like to put one factory on a planet and then farms that would max the pop of the planet if I had the final farm tech. then one economical building followed by all research buildings. I try not to build a lot of starports. Wasted space most of the time
So far, I have only had military and research victories.

Was also thinking. Defense vs offense. This has been a subject of debate. Here is an interesting thing about it though. If you place a ship on each of your planets as defense, they usually get the first shot unless you see them coming and attack them instead. This means that you don't get to strike back most of the time because they are a shot ahead of you. But, if you had defense against their type of attack, your ship will last longer and heal fast because it is on a planet. Just something I was thinking about.