Been a while since I played moo2. I did, it was probably just actually still in the 90s. The balance is significantly different. I remember "creative" in moo2 being absolutely absurd, but in moo1 the Psilon tech bonus is so strong that they're the #1 best race hands down. Addressing what to do in the game, the first question is "are the Psilons on this map?" Well, no, actually, it's "are my planets immediately going to start raining bears" but that's less frequent. If nobody wars the Psilons early in moo1 to keep them down, they
are going to settle all the hostile worlds first, they are going to terraform the crap out of them, and then they
are going to annihilate your fleet with swarms of deathballs your ships can't bring down. The AI in that version is ruthless*. Inertial stabilizers are a great early combat tech. Super useful for fighting early when they come out, but if what you really need is a different fuel range cell and you roll the stabilizer(techs accessible to research are randomly generated in moo1(each race has an affinity for each tech area)), you're really boned. Time to go trade something absurdly useful to the AI for fuel range. Unless you're the Darlocks, then they're all coming for you.
Klackons are stupidly good in moo1 too. #2 best no question. Their bonus is probably even better and they have no downside other than sucking at propulsion, which usually keeps them back from swarming everything. However, if they get speed 3 engines and range 5 early? Game's probably over. They build too fast, they're going to take everything.
*Generated, near as I can tell, with a pretty simple relationship ratio between population comparison and power comparison. If you have too much more population than they do, they hate you, full stop. So when you start approaching/surpassing 1/3 of galaxy total population(enough to block another race winning the council election all on your own) everyone is going to start hating you, you better be ready to war with 2/3 of galaxy at that point if you want to win. If they have too much more power than you do, in that they're winning, they're going to decide they can kill you and will attempt to do so. They'll break non-aggression pacts and alliances if they game is starting to be on the line. It's programmed to try and win, which is nice.