Originally posted by smallstepforman
With 1.17 and higher difficult levels, you end up severly lacking in science compared to AI's (even 4-6 techs behind). You desperately need Great Library to stay on par in the first 1/2 of the game. The fastest way to get to Great Library is to start of as Scientific (Alphabet) and research Writing (40 turns) and Literature (40 turns).
You can start the GL much earlier: e.g. start to build Pyramids and then switch to the GL.
So lets analyse the scientific civs:
If you're Persian (sci and industrious) you can build faster, but still miss out on the Great Library if the AI uses a great leader.
AFAIK usually AI uses them to build an army, not to hurry an improvement...
Germany is my favourite Civ, because its scientific and militaristic. With a quick strategic campaign, even if it means loosing a city or two, you're only goal would be getting that Great Leader and rush building the Great Library.
Finally I have decided to change my strategy and to concentrate on early expansion, military to get Great Leaders, money and culture. So Aztecs are the best: in fact, their UU gives extra the Expansionist ability

Stuff from villages is worse but Jaguar Warriors are not defenceless against barbarians, so the key is to produce A LOT of them at the beginning and send them in all possible directions. If you are not locked e.g. by two nearby expansionist civs and you have some luck, it may give you a huge lead in territory.
In my current game (Regent, Huge, Continents + big land mass, Raging) I am on a big (perhaps the greatest) continent, I started with Japanese, Germans and Iroquois nearby. Japanese are down (they respawned at a distant part of my continent), I finish to "deal" with Germans and start to think about Iroquois. In the Ancient era I was getting techs from villages or bought from other civs, I built Oracle and managed to get Leaders to rush build Pyramids, Great Library and Colossus. Now I look forward a next one to build Forbidden Palace, perhaps in Leipzig

And after switching to Republic I am a tech leader (I am about to discover Chivalry and want to get Military Tradition ASAP), about 4 times more culture than the next civ, quite strong army and a lot of cities. Moreover, I'm still BEFORE my Golden Age (I used Jaguars against barbarians only).
Regards,
Slawomir Stachniewicz