So, having completed the Cosmogenesis route (SMBH standard ending)...
I like it. Become the crisis is fairly linear (up until crisis level 5 you're weighing off not biting off more than you can chew versus preventing the enemy from building up and trying to acquire momentum to have enough forces and economy to hold your capitol until you can push the button. It's a lot of warfare, but strategic choices are generally about what fights to pick.
Cosmogenesis, OTOH, allows for radically different playstyles.
Yes, you can be aggressive about acquiring subjects to throw into the synaptic lathe, conquering and making subjects to turn into scholariums...
But you can also take it slow. Spec into energy and buy slaves off the galactic market to feed the Lathe, and try to make nice with the neighbors while pushing your agenda in the galactic community...
You need to complete at least two universe rewrite attempts to get to Level 5, so your neighbours may get a bit peeved if the rewrites fail, but it shouldn't be enough for the AI to declare war over it - particularly not if you keep your fleets up to date and filled out to deter any nonsense.
Also, note - it pays to think about the order in which you embark your planets, your economy is going to collapse in on itself sooner or later.
That said - if you are playing as anyone but the crisis empire, you'll want to stomp the crisis empires fast - Cosmogenesis gets AE ships and tech, so hitting them early before they can build up a significant fleet of AE ships is recommended. And if you can't beat them in a straight fight and they get to level five, snipe the Horizon Needle before it's too late.
Why? Not only because the Crisis empire wins the game if they get to level five and the Needle completes the Grand Tour and dives into a black hole, but because when they dive, a lot of stars in the galaxy (though not all) go boom (that's going to affect the trout population).
... My first game in the Machine Age got the Momnissiah crisis (well, and me).
I killed the Materialist FE (they were my neighbours and had a scion, and since the FE declared war on me three times, I took their worlds from them). Momnissiah killed the Spiritualists and was well on her way to killing the Machine FE and the Xenophobe AE when I dove into the supermassive black hole in the center of the galaxy. (Bad choice, in retrospect, should probably have gone with my first choice (Terminal Egress), oh well.)
Anyway, shoutout to the Awoken (my scholarium vassal) who built a whole screen filling fleet of science vessels and parked them in their home system in case I wanted them for some reason.
In other news, the Ecumenopolis in the Cybernetic shipset is Cyperpunk theme: It's got RGB lighting.