Eqqman said:
I've been finding it handy to setup my best production city with both HE & IW so that I can nearly always produce my most expensive military unit at a rate of 1 unit / turn. But I'm wondering if others find it more effective to split these up and combine them with other useful things like West Point & Red Cross so that you get a quality-over-quantity approach.
I usually find it more effective to group them differently.
Because the Whip is so much more effective than working mines, Heroic Epic + Globe Theater is game changingly effective.
Also, if you have a good production city, you can usually pound out a unit per turn with only one of those wonders. A simple production city during the state property era kicks out 63 hammers per turn. Forge Factory Power plus one production wonder gives you a factor of three - 189 net per turn. Add a few resources, an extra food bonus, maybe attach a couple specialists, and you can get up to 70 hammers per turn without working too hard. You've also the option of attaching specialists, or switching to Police State for the extra boost you need to reach the 240 needed for Modern Armor.
If you have two good production cities, you should probably split the wonders so that you can stack them with something else. With only one good production city, pair them - especially if the city isn't good enough to build the units in one turn.
For Adventure 8, I ended up pairing Heroic Epic with the Globe Theater, Ironworks with the National Epic (the city was building nothing but wonders, and I had burned my best GP farm on the Heroic Epic), and matched West Point with Red Cross and an airport, to airlift CG III Medic defenders into each city I captured.
My favorite Ironworks combo is still Shrine + Wall Street, supplemented by Angkor Watted priests. If you are going to be running a lot of watermills and high science, Ironworks + Oxford also works.