There are two obvious ways to decide where to build this wonder. If we go strictly by net benefit, it should be built in the city with the highest beaker output, which will be Priapos after Copernicus's Observatory is completed. On a strict fairness approach, it should go in Berlin as the highest output city which doesn't already have a wonder.
One of these cities has a slight advantage over the other as a wonder location for a reason unrelated to either of these principles, which I'll leave open for citizen input for a bit.
If we're going to try to get any other late Medieval or early Industrial wonders, we should probably plan all of them as a set. For example where are Theory of Evolution and Hoover Dam going to go, if we decide to build them?