Let's start with raw data:
Civil Service:
+1 food from "fresh water" tiles. A real bomb if your cities have hills by a river side.
Chichen Itza - +50% Golden Age Length. Awesome on its own.
Pikemen. Whole new combat quality.
Theology:
Monastery, +2 culture from worked Wine or Incense. Pure luck if it's useful or not.
Garden, +25% great people generation. Awesomeness but you won't build it for a while.
Angkor Wat, -75% cost in culture of purchasing new tiles. Very useful early on to quicker expand on more valuable tiles without paying for them - allowing to spend cash on city states.
Hagia Sophia, +33% great people generation in all cities. Pile of awesome throughout the whole game.
Now, when you start and have enough space and time to sling (no Monty next door like in my last game
), you can try for one of those to open Middle Ages for you.
If you go Calendar early on, while building Stonehenge you can get Writing and start constructing Great Library. Then you research Philosophy to grab Oracle after Great Library. And this is the point where the dilemma starts.
You can either sling right away for Theology with your Great Library - or double back, get Animal Husbandry and Trapping and sling yourself into Civil Service. This second sling is a bit risky high up in difficulty cause AI may try to steal Great Library from you making you a sore loser.
Theology later leads to Education, Acoustics and Navigation which are great uses of great scientists for another sling. Civil Service will give you Knights and soon after Markets, Mints and Banks.
I'd say bonuses from both are pretty balanced - and there are certain situations when one sling would be better than another (spawn by 3x silver supports early Mint...). But in general, over a large number of games, what's your preferred and more often picked choice of entering the Middle Ages? Theology or Civil Service sling?
Civil Service:
+1 food from "fresh water" tiles. A real bomb if your cities have hills by a river side.
Chichen Itza - +50% Golden Age Length. Awesome on its own.
Pikemen. Whole new combat quality.
Theology:
Monastery, +2 culture from worked Wine or Incense. Pure luck if it's useful or not.
Garden, +25% great people generation. Awesomeness but you won't build it for a while.
Angkor Wat, -75% cost in culture of purchasing new tiles. Very useful early on to quicker expand on more valuable tiles without paying for them - allowing to spend cash on city states.
Hagia Sophia, +33% great people generation in all cities. Pile of awesome throughout the whole game.
Now, when you start and have enough space and time to sling (no Monty next door like in my last game

If you go Calendar early on, while building Stonehenge you can get Writing and start constructing Great Library. Then you research Philosophy to grab Oracle after Great Library. And this is the point where the dilemma starts.
You can either sling right away for Theology with your Great Library - or double back, get Animal Husbandry and Trapping and sling yourself into Civil Service. This second sling is a bit risky high up in difficulty cause AI may try to steal Great Library from you making you a sore loser.
Theology later leads to Education, Acoustics and Navigation which are great uses of great scientists for another sling. Civil Service will give you Knights and soon after Markets, Mints and Banks.
I'd say bonuses from both are pretty balanced - and there are certain situations when one sling would be better than another (spawn by 3x silver supports early Mint...). But in general, over a large number of games, what's your preferred and more often picked choice of entering the Middle Ages? Theology or Civil Service sling?
